Quantum DLT 2000 Handbook page 203

Peripheral. A device added to a system as a complement to the
basic CPU, such as a disk drive, tape drive, or printer.
Petabyte. A unit of measure consisting of one quadrillion bytes
(one billion megabytes).
Pivoting Optical Servo (POS). An optically-assisted servo system
designed for Super DLTtape for high-duty-cycle applications.
Q
QIC. Acronym for quarter inch cartridge. A tape storage subsystem
that uses .25-inch-wide media.
R
RAM. Acronym for random access memory. An integrated circuit
memory chip that allows information to be stored and retrieved by a
microprocessor or controller. The information can be stored or
accessed in any order, and all storage locations are equally accessible.
RAIT. Acronym for redundant array of independent tape drives.
ROM. Acronym for read only memory. Integrated circuit chip
containing programs and data that can be accessed and read but
cannot be modified.
Random Access. The ability to directly locate any piece of data
without having to read everything in memory or on disk.
Read After Write. A mode of operation that has the computer
read back each data block immediately after it is written on the
tape, checking that the data read back is the same as recorded.
QUANTUM DLTtape HANDBOOK G.15