Glossary
“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
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
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.