Product manual

Glossary
Maxtor DiamondMax16 G-9
bits to be stored per disk.
TPI – Acronym for tracks per inch. The
number of tracks or cylinders that are written
in each inch of travel across the surface of a
disk.
TRACK – One of the many concentric
magnetic circle patterns written on a disk
surface as a guide to where to store and read
the data.
TRACK DENSITY – How closely the
tracks are packed on a disk surface. The
number is specified as tracks per inch (TPI).
TRACK TO TRACK SEEK TIME – The
time required for the read/write heads to
move to an adjacent track.
TRANSFER RATE – The rate at which the
disk sends and receives data from the
controller. Drive specifications usually
reference a high number that is the burst
mode rate for transferring data across the
interface from the disk buffer to system RAM.
Sustained data transfer is at a much lower rate
because of system processing overhead, head
switches, and seeks.
U
Ultra DMA – (UDMA, or, more accurately,
Ultra DMA/133) is a protocol for transferring
data between a hard disk drive through the
computer's data paths (or bus) to the
computer's random access memory (RAM).
The Ultra DMA/133 protocol transfers data
in burst mode at a rate of 133 MBps
(megabytes per second), twice as fast as the
previous Direct Memory Access (DMA)
interface.
UNFORMATTED CAPACITY – The
total number of bytes of data that could be fit
onto a disk. Formatting the disk requires some
of this space to record location, boundary
definitions, and timing information. After
formatting, user data can be stored on the
remaining disk space, known as formatted
capacity. The size of a Maxtor drive is
expressed in formatted capacity.
V
VOICE COIL – A type of motor used to
move the disk read/write head in and out to
the right track. Voice-coil actuators work like
loudspeakers with the force of a magnetic coil
causing a proportionate movement of the
head. Maxtor's actuator uses voice-coil
technology, and thereby eliminates the high
stress wearing parts found on stepper motor
type actuators.
W
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 – Hard disks that
use a technology similar to an IBM model
using Winchester as the code name. These
disks use read/write heads that ride just above
the magnetic surface, held up by the air flow
created by the turning disk. When the disk
stops turning, the heads land on the surface,
which has a specially lubricated coating.
Winchester disks must be sealed and have a
filtration system since ordinary dust particles
are large enough to catch between the head
and the disk.
WRITE ONCE – In the context of optical
disks, technologies that allow the drive to
store data on a disk and read it back, but not
to erase it.