Maxtor ATLAS 10K IV User Manual page 250

Glossary
U
UNFORMATTED CAPACITY – The total
number of bytes of data that can be put on a
disk drive. Formatting the disk requires
approximately 20% of this space to record
servo data, addresses, boundary definitions,
and timing information. After formatting, user
data can be stored on the remaining disk space,
known as the formatted capacity.
ULTRA SCSI– Doubles the bandwidth of
SCSI Fast. it provides 8-bit (SCSI NARROW)
data rates of 20 Mbytes per second and 16-bit
(SCSI Wide) data rates of 40 Mbytes per
second. Shorter cables may be required. Also
known as Fast-20.
UNFORMATTED CAPACITY – The total
number of usable bytes on a disk, including the
space that will be required to later to record
location, boundary definitions, and timing
information. (See
formatted capacity
comparison.)
V
VOICE COIL – A fast and reliable actuator
motor that works like a loud speaker, with the
force of a magnetic coil causing a proportionate
movement of the head. Voice coil actuators are
more durable than their stepper counterparts,
since fewer parts are subject to daily stress and
wear. Voice coil technology is used in all
Maxtor drives.
W
wide SCSI – SCSI protocol permits wide data
transfers of 16 or 32 bits.
wide data transfer – Data transfer that allows
information transfer across 16 (or future 32)
bits. Faster than standard 8-bit data transfer.
WEDGE SERVO – The position on every track
that contains data used by the closed loop
positioning control. This information is used to
fine tune the position of the read/write heads
exactly over the track center.
WINCHESTER DISKS – Former code name
for an early IBM hard disk model, sometimes
still used to refer to hard drives in general.
G-12 Maxtor Atlas 10K IV
WRITE – The operation of recording or storing
data on a magnetic or other media. See also,
read.
WRITE ONCE – An optical disk technology
that allows the drive to store and read back
data, but prevents the drive from erasing
information once it has been written.
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