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OCTOBER 2006 VXA-320 TAPE DRIVE
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GLOSSARY
G
GLOSSARY
A
Adaptive Lossless Data Compression (ALDC) An advanced data compression
algorithm that provides an average compression ratio of 2:1 across multiple
data types. See also Compression.
Advanced Metal Evaporated (AME) media A state-of-the-art tape technology
designed for data storage. VXAtape cartridges use AME media.
American National Standards Institute (ANSI) Organization that sets
standards for SCSI and the safety of electrical devices.
B
Bit error rate (BER) The probability that a transmitted bit will be received in
error. The BER is expressed as a ratio of error bits to total number of bits.
Buffer A temporary storage area, usually in Random Access Memory (RAM).
The tape drive’s read and write buffers act as holding areas that enable the
tape drive to balance the rate at which it transfers data to or from tape with the
data transfer rate of the host. The VXA-320 tape drive has a 16-MB buffer.
Bus In a network, the electrical pathway between a computer and other
devices.
C
CAW-After-Write (CAW) A process that improves data integrity by reading
data immediately after it is written and writing the packet again if an error is
found. Individual packets are rewritten as necessary, optimizing speed and
capacity.
Compression The reduction in size of data to save space. Either the backup
application or the tape drive can perform compression. See also Adaptive
Lossless Data Compression (ALDC).
Cyclic redundancy check (CRC) The error detection technique that checks
for uncorrected data during a read operation.