Maxtor DIAMONDMAXTMPLUS6800 90683U2 Product Manual page 70

GLOSSARY
THIN-FILM HEAD
A magnetic transducer manufactured by deposition of magnetic and electrical materials
on a base material contrasted with prior art mechanical methods. Read/write heads
whose read/write element is deposited using integrated circuit techniques rather than
being manually wound.
THIN-FILM MEDIA
See plated thin film media.
TRACK
One surface of a cylinder. A path which contains reproducible information left on a
magnetic medium by recording means energized from a single channel.
TRACK-FOLLOWING SERVO
A closed-loop positioner control system that continuously corrects the position of the
disk drive's heads by utilizing a reference track and a feedback loop in the head
positioning system. (See also closed loop.)
TRACKS PER INCH (TPI)
A measurement of radial density. Tracks per inch of disk radius.
TRACK POSITIONING
The method, both mechanical and electrical, used to position the heads over the correct
cylinder in a disk drive system.
UN-CORRECTABLE ERROR
An error that is not able to be overcome with Error Detection and Correction.
UNFORMATTED CAPACITY
Storage capacity of disk drive prior to formatting; also called the gross capacity. (See
format.) The raw capacity of a drive not taking into account the capacity loss due to
storage of the format control information on the disk surfaces.
UNRECOVERABLE ERROR
A read error falling outside the capability of an ECC mechanism to correct, or not
able to be overcome by rereading the data in question, with or without repositioning
the head.
VOICE COIL MOTOR
A positioning motor that uses the same principle as a voice coil in a loudspeaker. The
motor has no detent positions. The mechanical motion output of it can be either rotary
or linear.
WHITNEY HEAD
A successor to the original Winchester read/write head design. The primary change
was to make the flexure smaller and more rigid. First used in IBM 3370/3380.
WHITNEY TECHNOLOGY
A method of constructing a read/write head in a rigid disk drive using a Whitney
head. In all other details it is the same as Winchester technology.
WINCHESTER HEAD
The read/write head used in Winchester technology, non-removable media disk
drives. May be either a monolithic or composite type. It is aerodynamically designed
to fly within microinches of the disk surface.
WINCHESTER TECHNOLOGY
A method of constructing a rigid disk drive using concepts introduced in the IBM
model 3340 disk drive. The primary changes from prior technology was to lower the
mass of the slider, use of a monolithic slider, radically changing the design of the
flexure and having the slider come to rest on a lubricated disk surface when disk
rotation ceases. In addition to the above, a totally sealed chamber containing the read/
write heads and disks was used to protect against contamination.
WINDOW MARGIN
The amount of tolerance a read/write system has for transition jitter at a specified error
rate level.
GL – 6
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WORD
A number of bits, typically a multiple of eight, processed in parallel (in a single
operation). Standard word lengths are 8, 16, 32 and 64 bits (1, 2, 4, or 8 bytes).
WRITE
The recording of flux reversals on a magnetic media.
WRITE PRE-COMPENSATION
The intentional time shifting of write data to offset the effects of bit shift in magnetic
recording.
WRITE GATE SIGNAL
A digital input signal level which causes the drive circuitry to record (write) data.