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GLOSSARY
174
Glossary
2TB
The 32-bit le systems have a maximum limitation of 2 TB per volume
set. 64-bit versions remove this limitation. so, if you are building large
warehouses, you should consider 64-bit versions.
Array
An array is a logical disk comprised of multiple physical hard disks.
The number of hard disks in an array is dictated by the type of the
array and the number of spares that may be assigned to it. (Arrays
are also sometimes referred to as containers). Furthermore, whether
an array can be built using part of the space on a disk (as opposed to
being forced to use the whole disk) depends upon the implementation.
Arrays are typically used to provide data redundancy and/or enhanced
I/O performance.
ATA
Acronym for “AT Bus Attachment” - a standard interface to IDE hard
disks. Western Digital’s IDE disk interface was standardized by ANSI to
form the ATA specication using a 16-bit ISA bus.
Auto Reassign Sector
SATA drives perform automatic defect re-assignment for both read and
write errors. Writes are always completed - if a location to be writ-
ten is found to be defective, the drive will automatically relocate that
write command to a new location and map out the defective location.
If there is a recoverable read error, the correct data will be transferred
to the host and that location will be tested by the drive to be certain
the location is not defective - if it is found to have a defect, it will be
automatically relocated to a new location and the defective location
mapped out. In the event of an unrecoverable read error, the error will
be reported to the host and the location agged as potentially defec-
tive. A subsequent write to that location will initiate a sector test and
relocation should that location have a defect.