【 Weak current College 】 basic disks and dynamic disks

Use of the disk can be divided into two categories: one category is the "basic". Basic disks are very common, we usually use disk types are basically "basic". "Basic" affected by the 26 letters, that is the letter of the disk can only be the 26 letters of the alphabet. Because A, B are floppy disk available actually occupied, 's letter only C ~ Z24. In addition, in the "basic" can only be built on four primary partitions (that is a primary partition, instead of the extended partition) or disk type is "dynamic". "A dynamic disk" is not affected by the 26 letters of the alphabet, it is used to name the "volume". "Dynamic" the biggest advantage is the disk capacity can be extended to non-contiguous disk space. It is this feature can help us solve the problem above.

A dynamic disk is the original basic hard disk partitions into a single volume (Volume). This volume sets can simulate we always say that the RAID, but this is the RAID is not simulated hardware chip support WINDOWS2000, only through the software, and hardware, is the resource consumption rate of more than hardware.

Local hard disk is partitioned using the standard method of the underlying disk partition, usually divided into FAT32 or NTFS partition. Each partition of a hard disk physical capacity.
Dynamic hard disk, the Disk Manager will upgrade your hard disk. Divided into simple, spanned, striped volumes, mirrored volumes, RAID-5 volume.
A simple volume is a portion of a physical disk that functions as if it were a physically separate unit in one. A simple volume is equivalent to WindowsNT4.0 and earlier primary partitions of dynamic storage. When you have only one dynamic disk, the simple volume that you can create a unique volume.
Spanned volumes from multiple disk unallocated space into one logical volume, so you can more effectively use multiple disk system on all space and all drive letters. If you need to create a volume, but do not have enough unallocated space for the volume on a single disk, you can be from multiple disks combining sections of unallocated space into one spanned volume to create sufficiently large volumes. Used to create the spanned volume of unallocated space area can be a different size. Spanned volumes are such organizations, one disk space allocated for the volume is full, and then start from the next disk, the disk space allocated for the volume is full.
Striped volume is 2 or more free space on the disk area into one logical volume has been created. A striped volume using RAID-0, allowing multiple distribution data on the disk. Striped volumes cannot be extended or mirrored, and do not provide fault tolerance. If you include a striped volume is one of the disks fails, the entire volume fails. When you create a striped volume, it is best to use the same size, model and manufacturer's disk.
A mirrored volume is a fault-tolerant volume that uses two copies of the volume or mirror copy is stored in the volume of data to provide data redundancy. Writes to mirrored volumes of all the data is written to on a separate physical disk on the mirror. If one physical disk fails, the data on the failed disk becomes unavailable, but the system can use the unaffected disk. When a mirrored volume in a mirroring failure, you must break the mirrored volume, makes another mirror into a separate drive letter volume. You can then create other disks in the new mirrored volume, the volume's available space should be the same or greater. When you create a mirrored volume, it is best to use the size, model and manufacturer are the same disk.
RAID-5 volume is a data and parity striped intermittently across three or more physical disks for fault-tolerant volumes. If a portion of a physical disk fails, you can use the remaining data and parity disk failure on the part of the data. For most activity consists of reading data in a computer environment in which data redundancy, RAID-5 volumes are a good solution.

The dynamic disk features and functionality to a basic disk, what is different?

Dynamic disks to basic disks, the biggest different is no longer a previous partition style, and is called the volume (Volume), its role as a matter of fact, and partitions, but with the following differences:

1, the number of volumes or partitions

The dynamic disk on a hard drive can create volumes there is no limit to the number. While the basic disk on a hard disk can be divided into up to four primary partitions.

2, disk space management

Dynamic disks can take different disk partition to create a volume set, and these partitions may be non-contiguous, this size is that several of the total size of the partition. This data is also segmented by storage in 2 hard, just like RAID-0. Disadvantages are the same, if RAID-0 and a hard disk error or bad, will cause the entire system crashes. So you want to use dynamic disks of this type of functionality, often to the mobile device or CD-R (RW)/DVD-R (RW), ZIP, etc. larger capacity drives backup data. Basic disk, you cannot collapse the hard drive partition and partition must be contiguous space, each partition of the largest capacity can only be a single hard drive's maximum capacity, access speed and compared to a single hard drive or upgrade.

3, disk capacity size management

Dynamic disk allows us to not restart the machinery of adjusting the size of a dynamic disk, and cannot be lost or corrupted data. While the basic disk partition once created, you cannot change the size, unless with the help of a third-party disk utility software such as PQMagic.

4, disk configuration information management and fault-tolerant

A dynamic disk is a disk configuration information on the disk, if the RAID fault-tolerant system will be copied onto another dynamic disk, so that you can use RAID-1 fault tolerance if a disk is damaged, the system will automatically call another hard drive data, maintain data integrity. While the basic disk configuration information is stored in the boot sector, there is no fault tolerance.

Dynamic drive what types:

1. * the * Volume (simple): the most basic features of dynamic disks, and contains only a single disk space on the disk, and the partition function is no different.

2, SpannedVolume (spanned volume): from multiple disk unallocated space into one logical volume, a bit like PQ inside the merge partitions.

3, MirroredVolume (mirrored): mirrored disk data can be divided into several copies of the same copy, mounted on a different disk, this ensures data integrity and security. Similar to RAID-1.

4, StripedVolume (striped): combine multiple (2 to 32) disk unused space creation to a volume. The partition size is all hard disk unused space and to different section of the read/write functions and RAID-0 similar.

5, RAID-5Volume (parity feature striped volume): and the above features are basically the same StripedVolume is not providing StripedVolume fault tolerance.