Weak knowledge of computer

Wednesday, January 11, 2012

【 Weak current College 】 802.11 context

June 12, 2003, IEEE802.11g official as technical standards publication, one month later, Wi-Fi Alliance certification for the first use of standard products. 802.11g IEEE802.11g can be viewed as IEEE802.11b, high-speed version, but in order to achieve 54Mbit/s of transfer rate, 11g adopted and 11b different OFDM (orthogonal frequency division multiplexing) modulation, it supports 54Mbps transfer rate.
IEEE802.11 standard was introduced in 1997, on this basis, in September 1999, the proposed standard and IEEE802.11b standard IEEE802.11a.
Boost wireless LAN standardization organization WECA (TheWirelessEthernetCompatibilityAlliance, also known as "Wi-Fi Alliance") was announced in November 2001, will follow the "IEEE802.11a" product identification tag to "Wi-Fi5" (this is because IEEE802.11a utilizes 5GHz band); WECA organizations previously will use 2.4GHz band wireless LAN IEEE802.11b "known as" "Wi-Fi".

Along with many other manufacturers a comprehensive intervention now 802.11 series wireless network product prices have reduced a lot. The newly launched TP-Link network card plus AP entry-type wireless network package, the price is less than $ 1000. The market and some integration of routers, switches, and other features of multifunctional ADSLModem AP sales for home users and SOHO family, this product has greatly reduced the CTO, is very attractive. From the compatibility and interoperability to consider the purchase of WLAN equipment, it is important to note that view ID, check whether the adoption of Wi-Fi certified integrated wireless network function notebook is no exception. Visit the official website of the WECA http//www.weca.net, online queries through the "Wi-Fi" certification of wireless networking products.
Currently on WLAN support best stand-alone operating system is WindowsXP, it will control on a wireless network interface integrated in a unified "wireless link" function, in the "Control Panel" to find it. For notebook users, do not use a wireless network, recommendations will be integrated wireless adapter off or external wireless network card removal; because the wireless adapter will continue to detect the surroundings have a wireless connection and the connection attempt, not only electricity, consume system resources, but also is a security risk.

In the midst of cheers, wireless network attracts everyone's attention, however our wireless network soft ribs should have an understanding. As a historical and a long history of technology, the wireless network has a variety of defects is inevitable and this is also the direction of its future efforts.
Bluetooth transmission distance less than is its Achilles heel. From a cost analysis, Bluetooth may not, however various patent fees and market speculation that Bluetooth got lost. A few years ago, it is Bluetooth universal opportunity, unfortunately we see various Bluetooth product price. Although today's Bluetooth is already down the altars, but in the transmission distance of more powerful Wi-Fi was established the advantages for Bluetooth in the competition very passive, basically giving up wireless LAN market, focused on bandwidth and transmission distance requirements lower mobile devices. In addition, the transmission distance of more recent infrared technology continues to develop, as a practical, low-cost solution.
Of course, Wi-Fi also is not perfect, security issues are bearing the brunt. In the commercial market, Wi-Fi eager to show in the wireless LAN, which had security problems on the breakthrough. Although in developing initial Wi-Fi will security problems in a certain height, but at least so far, many users still cannot be assured, especially those in low-priced universal product. In addition, the power consumption issues is by Wi-Fi must face, and this is its most than Bluetooth, lead in mobile device competition faced unfavorable situation.

Tuesday, January 10, 2012

【 Weak current College 】 wireless technology "WiMAX"?

Maximum transmission speed 75Mbit/seconds, the maximum transmission distance of up to 50km & high speed for long distance transmission of wireless communication technology "WiMAX" in the United States redoubled, much better than wireless LAN.

This technique is what will be applied in the fields of application will be how to? WiMAX Vision uses completely different with the wireless LAN. Wireless LANs are generally applied to a hundred meters of distance communication, namely, "LAN". While WiMAX is several kilometres to dozens of kilometers of wide application.

WiMAX standard based on the IEEE802.16. Generally can be divided into 2 types of IEEE802.16-2004 June this year to develop standards for basic IEEE802.16a. Envisaged maximum transmission distance of 7km ~ 10km fixed region. Another is being developed in IEEE802.16e, mobile terminal, the maximum transmission distance of 3km ~ 5km. Currently, there is a particular concern is the specification determined by 802.16-2004. It is expected that the first half of 2005, there will be a related product, it is used primarily to connect to the Internet service access lines. The alternative of using a telephone line, ADSL and so will the communication operators and users.

WiMAX in the United States's award-winning attention largely depends on the situation of the United States. Vast United States, even if you use a phone line or ADSL signal is transmitted to the distant suburban housing. This is also the hopes of WiMAX. WiMAX adoption and wireless LAN standard 802 .11A and 11g same OFDM modulation (OrthogonalFrequencyDivisionMultiplexing). The bandwidth of each channel to 20MHz. This also and 11a and 11 g is almost the same. But because you can outdoor fixed antenna and receiving radio waves in a stable way, so the radio waves can host the number of bits of higher than 11a and 11 g. Therefore, you can achieve 74.81Mbit/s maximum transfer rate. In addition, by location, very high the antenna transmitting power strong signal, and long-distance communication possible. WiMAX standards using 2G ~ 11GHz within a band. In the United States and Europe, plans assigned to WiMAX relative idle 2.5GHz, 3.5GHz and 5.8GHz band.

Friday, May 20, 2011

Weak current College】【classic Ghost full application skills is 20.

】【Printer brief A DOS of the parameters is not strange, DOS, many programs have parameters, although the letter is boring, but the functionality is very powerful. Ghost is a typical support parameters for DOS .programs that take full advantage of its parameters, we can better control the Ghost. A DOS of the parameters is not strange, DOS, many programs have parameters, although the letter is boring, but the functionality is very powerful. Ghost is .a typical support parameters for DOS programs that take full advantage of its parameters, we can better control the Ghost. Let them better to work for us, the previous example, we use the Ghost of parameters to make a card with automatic backup and restore hard .drive data since the start CD. It is because of numerous Ghost parameter, powerful, we need to put some of the most commonly used parameter lists for your usual reference use. Small tip ★ .Parameter (Parameter) is a program to provide us some hidden options by adding parameters, you can achieve a normal startup procedure cannot be achieved or can achieve, but it requires many steps can be achieved for functions, you can give us a lot of convenience .. ★ Parameters and procedures, parameters and arguments are separated by space characters. ★ We can leave the Ghost of parameter to write to some of the BAT file, and pass the control statement to .use it more easily clone and restore our system. 1. the disk to disk copy Graphical interface: DiskToDisk Parameter example: ghost-clone, mode = copy the .src = 1, dst = 2-sure-fx Parameters of function: copy the entire contents of a disk to disk 2, do not have to ask, after exit Ghost. 2. .put everything on the disk backup into an image file Graphical interface: DiskToImage Parameter example: ghost-clone, mode = dump, src = 1, dst = d: \ Win98sys.gho- .z3-sure-fx Parameters of function: backup machine first of all content on your hard disk to another hard drive d: \ Win98sys.gho file, high compression, do not have to ask, after exit Ghost. . 3. recovery from a backup image file to disk Graphical interface: DiskFromImage Parameter example: ghost-clone, mode = load, src = d: \ Win98sys. .gho, dst = 1-sure-fx Parameters of function: from backup to a second hard drive image file recovery to d: \ Win98sys.gho first hard disk, do not have to ask, after exit Ghost. . 4. partition to the partition copy Graphical interface: PartitionToPartition Parameter example: ghost-clone, mode = pcopy, src = 1: 1, 2: 1 - .sure-fx dst = Parameter function: copying the first hard drive first partition on the second hard drive on the first partition, instead of asking, after exit Ghost. 5. the partition content .backup into an image file Graphical interface: PartitionToImage Parameter example: ghost-clone, mode = pdump, src = 1: 1, dst = d: \ Win98sys.gho-z9-sure .-fx Parameters of function: back up the hard drive first partition to d: \ Win98sys.gho, the highest compression rate, do not have to ask, after exit Ghost. 6. .from the backup image file to the clone to partition Graphical interface: PartitionFromImage Parameter example: ghost-clone, mode = pload, src = d: \ Win98sys.gho: 1, 1: .1-sure-fx dst = Parameters of function: d: \ Win98sys.gho first partition in memory clone to a hard disk the first partition, instead of asking, after exit Ghost. .7. parallel port cable directly connected PC client Graphical interface: LPT / Slave Parameter example: ghost-lps Parameters of function: start client (two computers must also .implement Ghost). 8. parallel port cable for direct connection service machine Graphical interface: LPT / Master Parameter example: ghost-lpm-clone, mode = dump ., src = 1, dst = c: \ Win98sys.gho-sure-fx Parameters of the function: the service machine first hard drive back up the contents of the file to the client, without c: \ Win98sys .. gho asking, after exit Ghost. 9. hard disk directly betweenAdd clone Parameter example: ghost-clone, mode = copy the src = 1, dst = 2-sure . Parameters of function: in internal mode copies the first hard drive to a second hard drive, without prompting, direct cloning. 10. network backup Parameter example: ghost-nbm- .clone, mode = dump, src = 2, dst = c: \ xxxx.gho Parameters of function: connect by NetBIOS mode is ghost \ slave network remote PC and backup native second hard drive to the remote hard disk .C: \ xxxx.gho into a image compressed file. Small tip The remote client must use ghost-nbs command to start. 11. cloning an image file .to your hard drive Parameter example: ghost-clone, mode = load, src = e: \ savdsk.gho, dst = 1 Parameters of function: read E: \ SAVEDSK.gho .file and put it to a hard drive cloning. 12. the second partition backup as image file (restore) Parameter example: ghost-clone, mode = pdump, src = 1: 2 ., dst = g: \ imgs \ part2.gho Parameters of function: backup to a hard disk of the second partition to g: \ imgs \ part2.gho image files. Parameter example .: ghost-clone, mode = pload, src = g: \ imgs \ part2.gho: 2, dst = 1: 2 Parameters of function: loading (recovery) of the image file in the second partition to .the internal hard disk, a hard disk of the second partition. 13. copy a different hard drive different partitions Parameter example: ghost-clone, mode = pcopy, src = 1: 2 ., dst = 2: 1 Parameter function: copying the first hard drive partition of the second to a second hard drive first partition. 14. to restore to a second hard drive and adjust the .partition size Parameter example: ghost-clone, mode = load, src = g: \ imgs \ 2prtdisk.gho, dst = 2, sze1 = 60P, sze2 = 40P Parameters of function .: Clone g: \ imgs \ 2prtdisk.gho image file to a second hard drive, and the whole by 60% and 40% of the size distribution of the partition size. 15. to restore to a hard disk and adjust the .partition size Parameter example: ghost-clone, mode = load, src = e: \ imgs \ 3prtdisk.gho, dst = 1, sze1 = 450M, sze2 = 1599M, sze3 = 2047M Parameters of function: Clone e: \ imgs \ 3prtdisk.gho image files to a hard disk, and the whole partition size is: first partition 450MB, second partition 1599MB, the third partition 2047MB. 16. retention .of the first partition is not assigned to other Parameter example: ghost-clone, mode = copy the src = 1, 2, dst = sze1 = F, sze2 = sze3 = V, V Parameters of function: copying has three partitions of a hard disk to a second hard drive and keep the first partition of the same size as the source, but other partition free space reserved is not assigned. 17. to .restore to the last partition and adjust the partition size Parameter example: ghost-clone, mode = load, src = g: \ imgs \ 2prtdisk.gho, dst = 1, szeL Parameters .of function: loading an image file to disk last partition and in accordance with the capacity to revamp its size, the first partition is to use the remaining space. 18. from the parameter file read Parameter example: GHOST.EXE @ (parameter file) Parameters of function: GHOST command line parameters from the parameter file read and execute (note the parameter file is a text format). .Small tip In the parameter file can be written in text format contains any Ghost command line parameters, in addition to-AFILE = and-DFILE = parameters. 19. backup and automatic segmentation < .br> Parameter example: ghost-sure-clone, mode = pdump, src = 1: 1, dst = system.gho-span-split = 630 Parameters of function: it is the first hard .drive first partition information back to the current folder system.gho, if generated system.gho greater than 630MB, segmentation, GHO file generated by this parameter to backup large partition, and burn them to CD-r 650MB on it very useful. 20. backup and encryption Parameter exampleChild: ghost-sure-pwd, 666888-clone, mode = pdump, src = 1: 1, dst = system.gho Parameters .of the function: the statement is the first hard drive first partition information back to the current folder system.gho, and after the build 666888 GHO file password for encryption. After using Ghost recovery system.gho file, or to release the GhostExplorer file, .you must enter a password, you cannot recover or release files, which can play a role of confidentiality. If you enter ghost-sure-pwd-clone, mode = pdump, src = 1: 1, dst = system.gho, ie- .pwd behind without a password, the Ghost in production before the GHO file will ask the user to encrypt the password, you GHO must remember it well. To the GHO file encryption, others will not be able to easily view or restore the file. < .br>.

【 Weak current College 】 describes server secure hotspot 12 skills

Now the Server stored information more and more, but also more and more primary servers for the prevention of accidents or accidents caused massive attack, mainly in loss of data, the server will use many of the major general security skills to ensure its security. The following describes some of the main server security hot skills.

1.iSCSI skills

ISCSI skills is a new type of storage security skills, the skills of existing SCSI interface and Ethernet network (Ethernet) skills, so that the server can be used with the use of IP network storage device to exchange information. The skills not only prices are generally used by the industry standard for FibreChannel, and system administrators can use the same device to manage all of the network, and do not need to additionally equipment to perform network management.

ISCSI skills by IBM research and development of the two main agencies — California Israel Haifa Research Center in Almaden and common development, is a hardware device application, you can run IP protocol upper SCSI command set. Basic, iSCSI can achieve over IP networks, run the SCSI protocol so that it can in areas such as high speed Gigabit Ethernet implementation of routing. Now, many network storage provider committed to SAN (StorageAreaNetwork, storage area network) usage of fibre channel set to a practical standards, but its structure to the high capital costs, this is not an ordinary enterprises can afford; in contrast, NAS skills while inexpensive, but limited by bandwidth consumption, you cannot complete the mass storage and system difficult to meet the requirements of openness. The use of iSCSI skills in above two has been set up between the bridge. ISCSI skills are based on the IP protocol skills standards for SCSI and the TCP/IP protocol to connect to a LAN for network users, only need to do more investment, you can easily and quickly to the information and data to perform interactive transmission and management. Although iSCSI-based IP protocols, but have centralized SAN bulk open storage's quality. This skill information for side to face up to the high speed growth, on the other side was in the "data islands" of many small and medium-sized enterprises will undoubtedly has great appeal.

2. automatic backup skills

The skill is in network systems set up two identical and synchronization of file server, if one fails, another will now automatically access system to replace the failed all of the file server. By applying the skills, you can ensure that fault-tolerant system data information in the system or human error caused the damage or loss, the timely implementation of the data in the local high speed recovery; in addition, the skills can ensure fault-tolerant systems in times of unpredictable or against regional disasters (earthquakes, fires, machine destruction, etc.), the time in local or remote data and the entire system of disaster recovery.

3. transaction tracking skills

The skills for database and multi-user software needs to be designed to ensure that the database and multiple users use the software in all of the processing work is not over yet, or when a workstation or server occur suddenly damaged, be able to keep data consistent. Their works: for the specified transaction (action) or a complete, or what actions are not performed.

4. automatic testing skills

Generally speaking, an incorrect or damaged data before reverting, you must have the ability to timely notice that cause these incorrect reasons, therefore, a complete fault-tolerant systems should be can't support automatic inspection skills. Automatic inspection skills are used in troubleshooting high-speed detection of an effective means, especially with full self validating properties of self calibration device, not only to check the time out of the system modules, also able to detect the error itself. In the design of a fault-tolerant system, if the correct use of automatic testing skills, can significantly improve system responsiveness against errors, the errors of the incubation period is shortened, effectively preventing the further spread of incorrectly, thus it¡¯s helpful for other skills to function in a timely manner is not correct to make the correction.

5. memory error correction skills

This skill is a server error correction transparent test and fault, it found that the skills and correct a memory is not correct, you can trick or treat data bits from the RAM is erased, thereby effectively reduce cannot be corrected by a number of incorrect.

6. thermal positioning skills

The skill is also a kind of check data incorrect skills, the skills can be written to the hard disk of data to perform some check comparison work, thereby determining just read data can not be incorrect or could not have any other queries. In comparison to perform maintenance work, the skills can be put in automatically from the hard disk has just written data read out with the original data in memory to perform the comparison. If there is incorrect, the application in an opened within the hard drive is called "thermal positioning reroute zone" of the area, the hard disk bad area recorded and will be determined by the data in a bad area with the original data is written to the thermal positioning reroute the area.

7. automatic restart skills

Automatic restart of skills means PC server can not manage to complete restart process, in an extremely rapid recovery system running.

8. network monitoring skills

This skill enables users in one common client to monitor all use of the network server, monitor, and determine the server can not be "healthy" and once the server chassis, fans, memory, processor, system information, temperature, voltage, or third-party hardware of appear incorrect, it will alarm management. It is worth mentioning that the monitoring of the client and server side of the network canA LAN or Wan, directly through the network to the server to perform start, turn off or reset bit, great place is the management and maintenance work.

9. the failure of online correction skills

Failure of online correction skills including faulty parts pluggable and part of the online configuration skills. Pluggable components have a hard disk, memory, peripheral cards, power supplies, fans, current PC server to be proud of the skills are PCI Hot plug. Modular design will be the future direction of development.

10. file allocation tables and directories table skills

Hard disk file allocation tables and directories table stored file in the location on your hard disk and the file size, and other information, if it fails, the data is lost, or mistaken as to the other file. By providing two same file allocation tables and directories table, put them in a different location, in the event of a failure, the system will make a prompt, thereby achieving fault tolerance purposes.

11.VersaStor skills

The skill is the Compaq computer company in the data storage, it is one of the masterpieces of the biggest bright spot is the first realization of the concept of network storage pool to eliminate the present widely exists in different storage system boundaries, so that you can in a different storage system to perform easy storage and management. In addition, the storage pool capacity can also be based on different servers and use the programs dynamic and transparent scaling, support for different server data for seamless, transparent and portable. VersaStor skills can be any one of the network connection with SAN storage system provides online storage space acquisition and storage, regardless of the manufacturer; and the skills simplifies the deployment of storage systems, storage management consists of General machinery labor performance to a higher level.

12.AutoRAID skills

This skill is a combination of the advantages of different RAID multilevel RAID arrays for the skills that will last use of the data placed in storage by RAID0/1 of high-speed and high-performance hard drive, the less frequently used data in RAID5 storage of cost-effective hard disk. With AutoRAID, system installation, configuration, and extensions become basic and easy, this ability is no longer need the data to be transferred to other hard disks in the array, simply install the new hard disk, you can automatically AutoRAID determines the size of the hard disk, and it isn't hard disk array; the system will use the new hard disk space, and more data in RAID0/1 storage to improve system performance and speed of access. In addition, AutoRAID can manage different capacity hard disk consists of the hard disk array.

【 Weak current College 】 antivirus slowing down computer causes and treatments

Antivirus slowing down computer causes
Antivirus software needs to be in memory or look for virus signature file. This is a huge amount of computation, low profile machine speed impact is obvious.
In addition to CPU resources, the anti-virus software will need to run the program, the file open/save time for additional disk read operation. Frequent hard disk read blocking other processes and virtual memory of your hard disk read and write operations, making the CPU and the machine must be waiting, thereby holding back for a machine.
(In process management overhead? please know friends added)
Optimal use of anti-virus software
Eliminate unnecessary scan operation
There will be no threat of files to exclude from the scope of the scan checks, will greatly reduce the antivirus software on the system pressure and delay, and improve overall operating efficiency.

Because not all files can cause the spread of viruses; at the same time, even if the computer has a virus of the original data, it also needs to be running the opportunity may be activated. Thus, under normal conditions, the following should be excluded from the scope of killing the antivirus software:

Compress documents: * .zip .rar/*/*/* .cab .gz
Note: If the compression package really viruses, they are only in the extracted may be running. In the extract, realtime protection antivirus software has to be clean, compact package with a virus and will not cause harm.
Because of the extract is high intensity calculation process, therefore cancel the scan compressed files will effectively reduce the CPU usage of antivirus software.
QQ chat: * .db
QQ chat, this data file is repeatedly modified, thus also be anti-virus scanning repeatedly, seriously affecting the hard drive performance. This type of file is not a virus, don't cancel the scan when more pending! (* .db is also possible that other software's database files)
Large media files: * .wav .mp3/*/*/* .bmp .tif
These huge media file is not a virus. Cancel their scanning can accelerate the speed of the open folder.
*.ttc/*.ttf/*.txt
These files can be excluded from the scan, but is not a major problem. More work needs to be excluded data can search your hard disk > 2 MB file, depending on the circumstances excluded (for example you are the artists, you might also need to be * .psd excluded).

Reduce manual scans
All scan all disks will spend a lot of time, usually no need to do so.

In General, scan the system disk, other spare ProgramFiles directory, download software, storing them in the directory. Typically, if a virus, in most cases, one or two minutes you will have to reflect the (usually scan the windows directory on alarm).

If you feel there is an exception, then the machine and a full scan.

Security expert usage
That is, use the previous method, the anti-virus software will still cause the system speed. Antivirus capability higher users tend to have their unique usage.

Intermittent virus checking
Many experts usually does not turn on antivirus software, are only used when exceptions to check them.

Ordinary users can learn the practice, generally without anti-virus software, every couple of weeks set out idle time scan. In this way, the usual computer speed is guaranteed.

The truth is: episode too soon or ** large vicious viruses can cause particular concern, thus affecting dissemination; but mild virus, spread the opportunities even greater. As a rule of thumb, computer data in one or two weeks by virus seriously ** is unlikely, therefore, that the above-mentioned intermittent antivirus method.

Need a reminder about are:

Even if you turn on the best protection measures, important data backup is necessary!
And antivirus software, firewall best always.

With system monitoring tools replace the virus checking
If you are on your own computer is very confident that may wish to turn off antivirus software. Usually only often enable Task Manager, System Monitor taskinfo software view health, is an exception and then start the antivirus software to check. This approach eliminates the huge overhead. anti-virus software

Avoid using multiple antivirus software
Multiple anti-virus software at work, not only slow, system also may deadlock, crashes, and between competing for the system of control over the antivirus software.

If you want to use multiple anti-virus tools to guarantee system security, please note that while only one in the work.

In addition, the data show a lot of antivirus software is installed at the same time (not run) has already begun "many elephants are charging", such as "destroyer" discovery system equipped with Kaspersky Anti-virus will refuse to install, uninstall some antivirus software may cause other anti-virus software stop working or an exception occurs. (If you find that the antivirus software conflicts, in the page document your experience)

【 Weak current College 】 [posted] tell you Duo not known of the five areas

Now everyone knows Duo. People mention it is multi-tasking, multi-threading. However, eating this bowl of hot meals, we have to calm down, don't. Small series is to introduce you to easily overlooked details, or easily misunderstood. Want to help.

1. either Intel or AMD is not the first company to launch dual-core processors.

In fact, as early as 2001, IBM introduced its first dual-core Power4 processor. IBM was used in its RISC server. While AMD and Intel in 2004 when we plan to launch dual-core processor, in 2005, they launched a dual-core processors respectively. AMD and the 2005 21 April officially launched the AMDOpteron processor (used with the server and workstation), AMD Athlon64X2 Duo (for home and business users). While Intel is in the 2005 11 April launched their Pentium processor.

2. dual-core processor by the technical side, is inevitable.

Single-core processors to achieve better performance with faster processing speed, you need greater capacity, more strong thermal conditions. In fact in 2005, Intel cancelled production 4.0GHz "Tejas" single-core processors. Because they found that frequency to achieve this, it's driving voltage must achieve 100W. Moreover, to ensure its normal operation should have a temperature control, you need a larger radiator. But people need and not with the increasing the voltage of methods to increase speed.

The duo will be the best answer. Dual-core performance will undoubtedly have a new single-core, rather than the processor. This is the British Cole and AMD Launches dual-core processor-the real reason.
3. the ratio is not a clock frequency, but the overall performance of the

If you think that the duo have the fastest clock frequency, it is mistaken. If you only focus on the processor clock frequency, so you can choose Intel Pentium4 processors, model 670, its clock frequency is 3.8GHz, Pentium4660, clock speed is 3.6GHz. In dual-core, mainstream PentiumD820, its clock frequency only 2.8GHz. Compare with solo in the fastest processor frequency.

But with the same frequency is 2.4GHz Athlon643400 + and dual core Athlon64X24600 + contrast. After testing, the duo's performance improves. Duo's overall performance is the solo 1.4 times to 1.8 times.

4. dual-core related aspects

After investigation of domestic users, 48% of PC users do not understand what is dual core. 42% of people who think they know that the dual-core, 10% of people think they know what a duo; 52% of the people know it technology; only 12% of the people understand that the dual-core system. Market researcher Frost and Sullivan found in desktop processors, notebook and server processor market, there will be 15% to 25% of single-core processing was replaced by a dual-core processor. Dual-core is not just a kernel, the power of control, it also includes the security considerations and application of virtual technology.

5. dual-core or walk the edge of the processor

In addition to the dual-core, now there are four hot topics. Intel has to 07 years of arrival, prepare their quad-core server. And AMD is also actively preparing for war. Vision and then farther, Intel's eight-core processor "Yorkfield" also plans to meet in 2008. It seems that more and more nuclear will welcome everyone. At that time dual-core or what you want?

【 Weak current college 】 computer registry not open solutions (2)

Registry control user mode examples are:

¡Ï Control Panel functions;

★ Desktop appearance and icons;

¡Ï network parameters;

★ Browser functionality and features.

Some of these features is and user independent, some are for the user.

Computer related control item based on the name of the computer, and login user-independent. Control type example is to install an application, regardless of which user, program availability and access is unchanged, however, running the program icon depend on the network login user. Network protocol availability and priority based on the computer, but the current connection and user information.

Here are the registry entries for the base and the computer control of some examples:

★ Access control;

★ Login confirmation;

★ File and printer sharing;

¡Ï network card settings and protocols;

★ System performance and virtual memory settings.

No registry, Win9x and WindowsNT is not likely to exist. They are so complex that the .ini files used in the past to control their scalability needs almost unlimited installation and using the application, the registry enables it. However, the registry is more complex than the .ini file, to understand how it works, what to do and how to use it to do is the key to effective management system.

In the system registry control all 32-bit applications and their features and multiple applications of interaction, such as copying and pasting, it also controls all of the hardware and drivers. Although the majority can be through the control panel to install and set up, understand the registry still do for WindowsNT and Win9x system management basics.

To sum up, the registry holds a variety of parameters, direct control at Windows startup, hardware driver loading, as well as some Windows applications running, resulting in the entire system plays a central role. It includes:

(1) hardware and software forconfiguration and status information, the registry holds the application and the Explorer shell of initial conditions, preferences, and unloading of data.

(2) networking computer settings for the entire system and all kinds of license, the file name extension associated with the application, the hardware part of the description, status and properties.

(3) performance records, and other underlying system status information, and other data.

If the registry is damaged, the light from the Windows startup process to an exception, to and potentially cause the entire system of completely paralyzed. Therefore correctly understand, use, particularly timely backup and restore the registry in question, for Windows users, it is very important. Learned knowledge of the registry, and its associated application, it will cause your computer to multitask! thus becoming a real computer whiz!

Terminology associated with the registry:
①, registry: a database in a tree hierarchy. Physically, it is the System.dat and User.dat files; logically, it is the user in the registry editor, see the configuration data.
②, & quot; HKEY: root keys & quot; or & quot; & quot; primary key, its icon and Explorer Folders icon a bit alike. Windows98 will registry is divided into six parts, and call it HKEY_name, it means one of the key handle. (Figure 2)

③, key (key): it contains additional folder and one or more values.

④, subkey (subkeys): in a key (the parent key) following a key (a key).

⑤, branch (branch): represents a specific subkey and everything. A branch from the top of each registry, but usually used to describe a key and all of its contents. ⑥, valueentry (value): with a name and a value of the ordered value. Each key can contain any number of values. Each entry consists of three parts: a name, data type, data. (Fig. 3)

¡Ï name: does not include backslash characters, numbers, the representative character, a space ofany combination. The same key cannot have the same name.

¡Ï data types: string, binary, three double-word.

String (REG_SZ): as the name implies, a string of ASCII characters. Like & quot; & quot; HelloWorld, is a string of words or phrases. In the registry string value is generally used to indicate the file description, hardware ID, etc. Generally it consists of letters and numbers. The registry is always displayed string within quotation marks. Binary (REG_BINARY): F03D990000BC, there is no limit on the length of the binary value in the registry editor, binary data to hex mode displayed.

Double word (REG_DWORD): literally understand should be a DoubleWord, double-byte values. From 1-8 hexadecimal data, we used the hexadecimal or decimal form to edit. If D1234567.

¡Ï data: value of specific values, it can take up to the 64KB.

⑦, Default (default): each key include at least one value, called a default value (Default), it is always a string.

Registry of internal organizational structure and relationships
Computer configuration and the default user setting of noteCopies the table data is saved in the WindowsNT in the following five files: DEFAULT, SAM, SECURITY, SOFTWARE, SYSTEM, NTUSER.DAT. But Windows9x/Me/2000 will all registry files into 2 files System.dat and User.dat in:. They are binary files cannot be viewed with a text editor. They exist in the Windows directory with hidden, system, read-only property. System.dat contain computer-specific configuration data, User.dat contains user specific data. User.dat file location to a user name to log in, it is located in the user name of the directory, C:\\Windows\\profiles\\ system while C:\\Windows Directory keeps a default User.dat file for new users. Internal organization structure is similar to a directory management tree hierarchy structure.

WINDOWS registry has six root key, which is equivalent to a hard disk is divided into six sections.

At " & quot; Run dialog, enter RegEdit, and then click & quot; OK & quot; buttons, you can run the registry editor.

Left pane displays the registry root keys, this root keys altogether six. These root keys are all uppercase, with HKEY_ to prefix, this command conventions is the Registry functions of the Win32API keyword symbol variable.

Although in the registry, the six root keys looks in a parallel position, had nothing to do with each other. But in fact, HKEY_CLASSES_ROOT, and the information stored in the HKEY_CURRENT_CONFIG is stored in the HKEY_LOCAL_MACHINE portion of the information, and information stored in the HKEY_CURRENT_USER is deposited information of HKEY_USERS. HKEY_CLASSES_ROOT HKEY_CURRENT_USER and HKEY_LOCAL_MACHINE includes all of the information. Every time the system starts, the system will map out the information in the HKEY_CURRENT_USER allows users to view and edit the information.

In fact, HKEY_LOCAL_MACHINE\\SOFTWARE\\Classes is HKEY_CLASSES_ROOT, in order to view and edit the user easy and the system is designed as a root key. Similarly, HKEY_CURRENT_CONFIG\\SY-STEM\\CurrentControl is HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControl.

Save the HKEY_USERS default user and the current logged-on user's user information. HKEY_CURRENT_USER saves the current logged-on user's user information.

HKEY_DYN_DATA saved system run time, dynamic data, it reflects the current state of the system, each time the runtime are not the same, even on the same machine.

According to the above analysis, the information in the registry HKEY_LOCAL_MACHINE and HKEY_USERS can be divided into two broad categories, the two main types of details please see the following introduction.