SAS Serial Attached SCSI. A computer bus technology and serial communication protocol for direct
attached storage devices. SAS is a replacement for parallel SCSI with higher speeds, but still
utilizing SCSI commands.
scratch cartridge
A data cartridge that contains no useful data, but can be written to with new data.
SCD Single Character Display.
SCSI Small computer system interface.
SE Single-ended.
segment
A part.
sel Select.
Serial Attached SCSI (SAS)
A drive with a SAS interface can be linked directly to controllers. SAS is a performance
improvement over traditional SCSI because SAS enables multiple devices (up to 128) of different
sizes and types to be connected simultaneously with thinner and longer cables. It supports
full-duplex signal transmission up to 6 Gb/s. In addition, SAS drives can be hot-plugged.
serialize
To change from parallel-by-byte to serial-by-bit.
serializer
A device that converts a space distribution of simultaneous states, which represents 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.
signature
A digital signature that is used in cryptography to identify one party to ensure authenticity.
SKLM (IBM Security Key Lifecycle Manager)
IBM's EKM application that assists encrypting tape drives in generating, protecting, storing, and
maintaining encryption keys that encrypt information that is written to and decrypt information
that is read from tape media.
slot blocker
A slot blocker is used to restrict/close off a data cell so a data cartridge cannot be inserted.
Small Computer Systems Interface (SCSI)
A standard that is 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 320 megabytes per second). The variations include:
v Fast/Wide SCSI: Uses a 16-bit bus, and supports data rates of up to 20 MBps.
v SCSI-1: Uses an 8-bit bus, and supports data rates of 4 MBps.
v SCSI-2: Same as SCSI-1, but uses a 50-pin connector instead of a 25-pin connector, and supports
multiple devices.
v Ultra SCSI: Uses an 8- or 16-bit bus, and supports data rates of 20 or 40 MBps.
v Ultra2 SCSI: Uses an 8- or 16-bit bus and supports data rates of 40 or 80 MBps.
v Ultra3 SCSI: Uses a 16-bit bus and supports data rates of 80 or 160 MBps.
v Ultra160 SCSI: Uses a 16-bit bus and supports data rates of 80 or 160 MBps.
Glossary 347
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