 ATA (AT
Attachment) Interface
Originally developed as IDE interface, this
interface became known under various names. e.g. AT-Bus
interface, PC-AT interface, Task File interface.
Ablative
Method of optical recording where holes are made
in the optical media. Also referred to as "pit
forming."
Access Time
The time required by the read/write head to
reach the right position on the disk, i.e. the time
required for access to specific data. Access time equals
latency plus positioning time.
Actuator
Head positioning assembly consisting of a voice
coil motor and head arms to position the read/write head
and servo head over disk tracks.
Analogue
Analogue refers to the representation of data by
a continuously changing physical state, such as
intensity, frequency, or voltage.
ANSI
The American National Standards Institute.
Areal Density
A measure of the packing density of a disk
drive: achieved by multiplying the figure for tracks per
inch (tpi) with that for bits per inch (bpi).
Address Resolution Protocol
(ARP).
Within TCP/IP, ARP is the protocol that determines
whether a packet's source and destination addresses are
in the Data-Link Control (DLC) or Internet Protocol (IP)
format. ARP is necessary for proper packet routing on a
TCP/IP network.
ASCII
American Standard Code for Information
Interchange. A convention that assigns a standard binary
code to each upper and lower case character, numeral, and
typographic symbol.
ATL
Automatic Tape Library.
Axial Acceleration
The acceleration of the recording layer along
the fixed line normal to the disk reference plane at a
specified rotational frequency (speed), as sensed by the
optical system.
Axial Deflection
Optical
The deflection of any point of the recording layer
from its normal position with respect to the disk
reference plane, as determined by the normal optical
thickness of the protective layer, in a direction normal
to the reference plane.
Axial Runout,
Dynamic
Optical
The peak-to-peak displacement of a track in the
direction normal to the disk reference plane, measured
over one revolution, as sensed by the optical system.
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