Glossary–2
Hitachi Simple Modular Storage 100 User’s Guide
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1000Base-T
A specification for Gigabit Ethernet over copper wire. The standard
defines 1 Gbps data transfer over distances of up to 100 meters using
four pairs of Category 5 balanced copper cabling and a 5-level coding
scheme.
A
Array
A set of hard disks grouped logically together to function as one
contiguous storage space.
ATA
Advanced Technology Attachment, a disk drive implementation that
integrates the controller on the disk drive.
B
BIOS
Basic Input Output System, built-in software code that determines the
functions that a computing device can perform without accessing
programs from a disk.
Bps
Bits per second, the standard measure of data transmission speeds.
C
Cache
A temporary, high-speed storage mechanism. It is a reserved section of
main memory or an independent high-speed storage device. Two types
of caching are found in computers: memory caching and disk caching.
Memory caches are built into the architecture of microprocessors and
often computers have external cache memory. Disk caching works like
memory caching; however, it uses slower, conventional main memory
that on some devices is called a memory buffer.
Capacity
The amount of information (usually expressed in megabytes) that can
be stored on a disk drive. It is the measure of the potential contents of
a device; the volume it can contain or hold. In communications,
capacity refers to the maximum possible data transfer rate of a
communications channel under ideal conditions.
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