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Glossary
G-12 Maxtor Atlas 10K V
“asserted”) state of a binary number. See also,
signal assertion.
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 for
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.
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.
WRITE SAME
- A command requests that
the drive write the single sector of data
transferred by the initiator to the meduim
multiple times.