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by Brad Triggs
RAID is short for Redundant Array of Independent (or Inexpensive) Disks,
a category of disk drives that employ two or more drives in combination
for fault tolerance and performance. RAID disk drives are used
frequently on servers and increasingly being employed on personal
computers. Array is the operative word, which also dictates what the
cure is going to be, when a RAID disk recovery situation arises.
RAID disk repair, as you may expect is quite a complicated process. But
the good thing going for it is the chances for retrieving lost data is
higher than with most other types of disks because the typical RAID
architecture strategically distributes data randomly across the array.
What this sort of architecture demands of recovery professionals is to
specialize in the disk’s many different levels.
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In a nutshell, these are all the levels that the RAID disk recovery team
is up against. RAID 0, 1, 0+1; RAID 3, 4; RAID 5; RAID 10; Hardware RAID
including: AMI, Compaq, Dell, Adaptec, IBM, etc.; and, Software RAID
including Mac OS; Windows Servers including 2K, XP, NT; Linux, Solaris,
Novell, etc.
Just some RAID systems that most RAID disk recovery specialists should
all be familiar with are: Quantum Snap Server; Maxtor MaxAttach; Adaptec
AAA131; Compaq; Dell Perc Systems; IBM; AMI; Mylex; and yes, many
others!
The two most common implementations of the RAID architecture are Levels
4 and 5. Level 4 provides block stripping with a parity check. When a
data disk fails, the parity data is used to create a replacement disk.
Level 5 provides data stripping at the byte level and also stripe error
correction information, which results in excellent performance and good
fault tolerance. These two types are certainly the best friends of the
RAID disk recovery expert as these are the easiest to restore when the
situation aris
Brad Triggs provides more information on Data Recovery at his website:
Data-Recovery-Central.com - RAID Data Recovery
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