Fujitsu MHW2060AC User Manual Page 261

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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.
CHS addressing for drives
The CHS addressing collectively refers to the parameters defined by BIOS of the
host system, which, for example, include the number of cylinders, the number of
heads, and the number of sectors per track in the drive. The physical
specifications of the drive do not always correspond to these parameters.
The CHS addressing cannot make full use of the physical storage area of these
drives. To make the best use of these drives, the use of LBA addressing is
required.
Command
Commands are instructions to input data to and output data from a drive.
Commands are written in command registers.
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.
Master (Device 0)
The master is the first drive that can operate on the AT bus. The master is daisy-
chained with the second drive which can operate in conformity with the ATA
standard.
C141-E258 GL-1
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