Quantum LTO-9 HH SAS, User Manual

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Glossary
Quantum LTO-9 HH SAS User’s Guide 109
R/W Read/write.
S
SAC (Service Action Code) Code developed to indicate possible FRU
or FRU's to replace to repair the hardware.
SAS Serial attached SCSI interface.
scratch cartridge A data cartridge that contains no useful data, but
can be written to with new data.
segment A part.
sel Select.
serialize To change from parallel-by-byte to serial-by-bit.
serializer A device that converts a space distribution of simultaneous
states representing data into a corresponding time sequence of
states.
servo, servos An adjective for use in qualifying some part or aspect of
a servomechanism.
servomechanism A feedback control system in which at least one of
the system signals represents mechanical motion.
Small Computer Systems Interface (SCSI) A standard used by
computer manufacturers for attaching peripheral devices (such
as tape drives, hard disks, CD-ROM players, printers, and
scanners) to computers (servers). Pronounced “scuzzy”.
Variations of the SCSI interface provide for faster data
transmission rates than standard serial and parallel ports (up to
160 megabytes per second). The variations include:
- Fast/Wide SCSI: Uses a 16-bit bus, and supports data rates of
up to 20 MBps.
- SCSI-1: Uses an 8-bit bus, and supports data rates of 4 MBps.
- SCSI-2: Same as SCSI-1, but uses a 50-pin connector instead of
a 25-pin connector, and supports multiple devices.
- Ultra SCSI: Uses an 8- or 16-bit bus, and supports data rates of
20 or 40 MBps.
- Ultra2 SCSI: Uses an 8- or 16-bit bus and supports data rates of
40 or 80 MBps.