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RAID Glossary
This glossary contains some basic terms that may aid your understanding of RAID technology.
Term Definition
Array Two or more hard disk drives that are grouped together and function as a single drive to the
host computer.
Fault tolerance The ability of a computer to continue its function, even after one or more hard disk drives have
failed.
Intel
®
Application Accelerator RAID edition (IAA) Software program that replaces the original ATA drivers provided with
the Microsoft
®
Windows
®
operating system. The IAA replacement drivers are optimized for computers using certain Intel
®
chipsets.
Logical drive Two or more hard disk drives that are grouped together so that they appear and function as a
single or logical drive to the host computer.
Mirrored/Mirroring All data on a primary hard disk drive is duplicated on a secondary drive, to provide data
protection.
Parity A type of data protection that uses verification to detect errors in data.
Physical drive The actual hard disk drive.
RAID An acronym for "Redundant Array of Independent Disks". This method of combining small,
inexpensive hard disk drives offers advantages for data availability, equipment cost, and system performance.
RAID-0 See "Striped/Striping"
RAID-1 See "Mirrored/Mirroring"
Redundant
(Information Technology use) Additional computer components, such as hard disk drives, that are installed to back
up the primary resources in case of failure.
S-ATA An acronym for "Serial Advanced Technology Attachment." This is a standard that uses serial
signaling technology and is used for connecting hard disk drives into computers.
Striped/Striping Data is spread evenly over multiple hard disk drives for improved system performance. There
is no data protection.
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