Glossary
Actuator
Head positioning assembly. The actuator consists of a voice coil motor and head
arm. If positions the read-write (R-W) head.
AT bus
A bus between the host CPU and adapter board
ATA (AT Attachment) standard
The ATA standard is for a PC AT interface regulated to establish compatibility
between products manufactured by different vendors. Interfaces based on this
standard are called ATA interfaces.
Command
Commands are instructions to input data to and output data from a drive.
Commands are written in command registers.
Connector (Connector Plug: Host system side)
It means a host receptacle (described in this Glossary), when a drive is connected
to a host system without use an interface cable. In case of use an interface cable
for connecting to a host system, it means the connector plug which consists of
terminals and housing of the cable.
Cover
A lid of DE. It is a metallic part labeled the model name and its revision. This
part is attached to the opposite side from PCBA on the disk drive.
Data block
A data block is the unit used to transfer data. A data block normally indicates a
single sector.
DE
Disk enclosure. The DE includes the disks, built-in spindle motor, actuator, heads,
and air filter. The DE is sealed to protect these components from dust.
Host receptacle
Host receptacle is a connector type on the host system that the signal segment of
Serial-ATA unifies with the power supply segment.
C141-E254 GL-1
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