【 Weak current College 】 hard drives for type

Desktop hard drive
Desktop hard drive is the most common PC internal storage devices. As a user on a personal PC performance needs, desktop hard drive in North Korea's large-capacity, high speed, low noise, single-disc capacity increase year by year, mainstream speed reached 7200RPM, and even a SATA interface 10000RPM harddrive. Desktop hard drive manufacturers are Seagate, Maxtor, Western data, Hitachi, Samsung, market competition is very fierce.

Notebook hard drive
Portable hard drive as the name implies, is used in notebook storage devices, notebook is its portability and mobility, so the notebook hard drive must be in volume, stability, power consumption, achieve very high demand, and cushioning.

Laptop hard drive and desktop hard drives from the product structure and working principle, no distinction between essence, portable hard drive is characterized by the largest compact, standard products with a diameter of only 2.5 inches (also in 1.8 even smaller), thickness is far lower than 3.5 drive. General thickness only 8.5mm-12.5mm, weight in 100 grams, dapper. Laptop internal space is small, thermally challenged, and the battery energy limited, plus mobile in the inevitable clash, on its part of the volume, power and ruggedness and high demands. Notebook hard drive design itself than desktop hard drive better shock function, when it encounters a shock to temporarily stop the hard drive protection.

Notebook hard drive due to disc diameter small, low power consumption limit, shock, and other factors, performance relative to lag behind the desktop hard drive. A desktop system, hard drive motor spindle speed of 7200 RPM called mainstream, million go hard had also been launched, and in notebooks or 4200 go, part of the new use of hard drive 5400 go, mainly because the notebook hard drive space is small, but with high speed motor will bring greater power consumption and heat output. In the cache capacity portable hard drive also slightly less than desktop hard drive. Speed and caching are low, natural data transfer rate is also lower. The basic interface, portable hard drive and desktop development fair, the market mainstream notebook hard drives are ATA100 interface standards, Fujitsu has introduced the industry's first 2.5 "SATA hard drive.

Current notebook hard drive direction of development is to shape smaller, lighter, capacity and quality. Toshiba has spearheaded the development and production of a hard disk 1.8 "specifications, some thin notebook. However at present 1.8 products in retail market is extremely rare. This ultra small form factor hard disk you want to go through one interface can be used in the current 2.5 inch notebook hard drive. In addition to the hard drive 1.8 '', smaller 1-inch HDD (MicroDrive), has 4 GB of capacity has been reached, the appearance and interface to C F T Y P E-card, transfer mode for UltraDMAmode2. Actual transfer speed has reached around 5MB/sec. Disc go to 128KB 3600rpm, cache capacity. Of course, the hard disk is still only as a secondary storage device.

Laptop hard drive are often saved with important data, plus portable mobile features, its safety performance is very important indicator. Now the hard disk supports S.M.A.R.T (auto-detection, analysis and reporting) technology, use the S.M.A.R.T technology, which can effectively protect your hard drive. Predictable hard drive failure is hard drive performance deterioration. In fact, a hard drive failure of 60 per cent are mechanical in nature, such a failure, the S.M.A.R.T is available. S.M.A.R.T can provide effective data protection that helps to reduce the low risk of data loss, and advance alerts let you arrange timely replacement hard drive.

In addition many portable hard drive also adopted SPS technologies, SPS (ShockProtectionSystem) i.e. shock protection system. The impact on the hard drive in, keeping the head is not affected by vibration, Magnetic heads and magnetic arm parked on the platter, impact energy absorption by the rest of your hard disk, which can effectively improve the performance of your hard disk, a hard drive to use in transport, and the installation process to minimize the damage from shock. Some products are introduced the second generation protection system (SPSII), can be more effective to protect against external shocks caused by damage to the hard disk.

Server hard drive
Server hard disk performance requirements is far higher than desktop hard drive, this is a large amount of data from the server, high-load, high speed requirements. Server hard drive generally use SCSI interface, there is a high end fibre channel interface, very few low-end server using the ATA hard drives on the desktop computer, performance is greatly affected.

Server hard drive has the following four characteristics.

1. speed
Server hard drive speed is very high, 7200 RPM, 10000 products have been very popular, and even reached 15000. It is also equipped with a larger cache write-back, generally is 2 MB, 4MB, 8MB or 16MB, even has 64 MB of products. Average access time is short; external transfer rates and internal rates higher.

2. high reliability
Because the server's hard disk is almost 24 hours non-stop operation, under a huge workload. It can be said that the hard drive if there is a problem, the consequences would be unthinkable. In addition to the use of household hard drive S.M.A.R.T (self-monitoring, analysis and reporting technology), hard drive manufacturers have adopted their own unique state-of-the-art technology to ensure data security. In order to avoid accidental loss of, the server hard drive generally can withstand 1000G 300G to impact.


In order toImprove reliability, the server uses a redundant array of independent disks (RAID) technology. RAID technology is the equivalent of putting a copy of the data copied to another hard drive, if one hard disk is damaged, you can recover data from another.

3, bandwidth, large
Most servers use data throughput, CPU share very low SCSI hard drives. SCSI hard disk must be SCSI interface to use, some server Board integrates the SCSI interface, Ann has dedicated to the approximately 10-50 persons at the same time during normal working hours, random access to a server or workstation. In this case it is recommended that you choose a SCSI interface hard drive.

High-performance servers and workstations is intended primarily for mission-critical and heavy workloads of file servers, load the equivalent of more than 50 people in 24 hours a day at the same time, while for the video, animation, and other demanding workstation. In these situations it is recommended that you use high-end SCSI.

Hard drive type selection

Ordinary household or small business desktop user demand for hard drive performance is relatively low, but also very rarely on storage systems offer high-performance requirements, and therefore generally recommend the use of ATA, SATA interface hard disk, part personal audio or video workers can consider using SCSI interface.

Medium server and workstations is intended primarily for workload relatively light or medium enterprise environment, the load is equivalent to approximately 10-50 persons at the same time during normal working hours, random access to a server or workstation. In this case it is recommended that you choose a SCSI interface hard drive.

High-performance servers and workstations is intended primarily for mission-critical and heavy workloads of file servers, load the equivalent of more than 50 people in 24 hours a day at the same time, while for the video, animation, and other demanding workstation. In these situations it is recommended that you use high-end SCSI.