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CHAPTER 4: Advanced Hardware Setup
40
In the graphic below, each letter represents a unique block
of data, and each column represents a separate hard drive.
How it makes file storage cheaper
Because RAID 0 lets your computer see multiple hard drives
as a single drive, you can install several lower capacity (less
expensive) drives and have the same single-drive storage
simplicity and capacity as a larger, more expensive hard drive.
Drawbacks
Unfortunately, RAID 0 lets multiple drives behave as one in
another way. If part of the array fails (such as a hard drive
crashing), the entire array fails. Because the drives are treated
like a single drive, parts of files (including operating system
files) can be spread across several drives, leaving the
computer with only file fragments if one drive fails. Regular
and frequent backups are critical.
Another drawback is that RAID 0 treats each hard drive as if
it has the storage capacity of the smallest drive in the array.
So if you have three drives (300 GB, 250 GB, and 200 GB) in
a RAID 0 array, your computer only recognizes 600 GB total
capacity.
RAID 1 for security
RAID 1 maintains a complete copy of all files on each physical
hard drive in the array. Maintaining simultaneous, complete
copies of files across multiple hard drives is called mirroring.
If a drive fails, the mirrored drive takes over and acts as the
primary drive.
A
C
E
B
D
F
RAID 0
8512162.book Page 40 Tuesday, February 13, 2007 3:44 PM