Sun Microsystems StorageTek T9840, Руководство пользователя

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98 T9840 User’s Reference Manual • September 2008 Revision YA • 95739
block A collection of contiguous records recorded as a unit. Interblock gaps separate
blocks, and each block can contain one or more records.
buffer A routine or storage that compensates for a difference in the rate of data flow, or
the time of occurrence of events when transferring data from one device to
another.
burst In data communication, a sequence of signals counted as one unit in accordance
with a specific criterion or measure. (A)
C
capacity Total amount of User Data stored on one data cartridge in 8-bit bytes.
Synonymous with “User Capacity” or “Native Capacity”. This is the capacity that
the user sees after the ECC/Format/ERP and other overhead has been assessed
(no compression).
capacity, raw Total amount of data stored on one data cartridge in 8-bit bytes before any
ECC/Format/ERP and other overhead has been assessed (no compression).
capacity, user Total amount of data stored on one data cartridge in 8-bit bytes that is sent by
the host computer. This is the capacity that the user sees after the
ECC/Format/ERP and other overhead has been assessed (no compression).
cartridge A storage device that consists of magnetic tape on a supply reel in a protective
housing.
cartridge scratch loader A device that attaches to a tape drive to automatically load and unload tape
cartridges into and out of the drive.
CC See cleaning cartridge
cleaning cartridge A data cartridge that contains special material to clean the tape path in a
transport or drive.
compress To save space by eliminating gaps, empty fields, redundancy, or unnecessary
data to shorten the length of records or files. (IBM)
condition One of a set of specified values that a data item can assume. (IBM)
conditioning time The amount of time to prepare a tape cartridge for use in a T9840 Tape Drive.
configuration The manner in which the hardware and software of an information processing
system is organized and interconnected. (T)
connector An electrical or optical part that joins two or more other parts.
D
data error rate The number of errors that occur per a measurable amount of data on a tape.
data rate The speed of a data transfer process, usually expressed in bits per second or
bytes per second. (IBM)