A standard that is specified by Adobe Systems, Incorporated, for the electronic distribution of documents. PDF files are compact, can be distributed globally (email,
the Web, intranets, or CD-ROM), and can be viewed with the Acrobat Reader. The Acrobat Reader is software from Adobe Systems that can be downloaded at no
cost from the Adobe Systems home page.
PROM
Programmable read only memory.
PS
Power supply.
PWR
Power.
R
rack
A unit that houses the components of a storage subsystem, such as the library.
rackmount kit
A packaged collection of articles that are used to install the rack-mounted version of the library.
RAM
Random access memory.
Random access memory
A storage device into which data is entered and from which data is retrieved in a nonsequential manner.
RAS
Reliability, availability, and serviceability.
record
A collection of related data or words, which are treated as a unit.
recording density
The number of bits in a single linear track measured per unit of length of the recording medium.
recoverable error
An error condition that allows continued execution of a program.
ref
Reference.
reg
Register.
reinventory
To inventory again.
retension
The process or function of tightening the tape onto the cartridge, if it is sensed that the tape has a loose wrap on the cartridge.
robot
Picker.
robotics
Picker assembly.
RPQ
Request for price quotation.
R/W
Read/write.
S
s
Seconds of time.
SAC
Service Action Code. Code that is developed to indicate possible FRU or FRUs 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.
SCSI
Small computer system interface.
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 that 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.
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
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.
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