Glossary
SuperLoader User’s Guide 267
linear recording
Recording technology in which data is written in tracks
that run the length of the tape media. Contrast with helical scan
technology which records data diagonally across the tape.
M
MB Megabyte. A unit of measurement equal to 1 million bytes.
MCBF Mean Cycles Between Failures. This is average cycle count
between possible failures. A cycle is the movement of a cartridge from the
tape drive to a magazine slot and the selection of another cartridge and
moving that cartridge back to the drive.
MHz MegaHertz. A measurement of frequency in millions of cycles per
second.
MTBF Mean Time Between Failures. Reliability rating indicating the
expected failure rate of a product in power on hours (POH). Since
manufacturers differ in the ways they determine the MTBF, comparisons
of products should always take into account the MTBF calculation
method.
MTTR Mean Time to Repair. The average time it takes to repair a drive
that has failed for some reason. This only takes into consideration the
changing of the major subassemblies such as the printed circuit board or
sealed housing. Component-level repair is not included in this number as
this type of repair cannot be performed in the field.
media The material or device used to store information in a storage
subsystem, such as a tape or disk drive. DLTtape media is a high-grade
metal particle (MP) formulation that takes advantage of the latest
advances in binder chemistry. By combining both solid and liquid
lubricants in the tape binder system, tape and head wear are reduced
while repelling airborne particles that could affect read/write head
performance. In addition, by using a uniform particle shape, a dense
binding system, a smooth coating surface, and a specially selected base
file, Quantum DLTtape half-inch cartridge tapes take advantage of
shorter wavelength recording schemes to ensure read compatibility with
future generations of DLT drives.
Metal Particle (MP) tape A magnetic recording media in which a flexible
base is coated with a mixture of magnetic particles and a bonding agent.
See also media.
microprocessor The integrated circuit chip that performs the bulk of
data processing and controls the operation of all of the parts of the
system.
microsecond (µs) One millionth of a second (.000001 sec.).
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