Western Digital WDE2170 User Manual
Page 50
Glossary
WD Enterprise WDE2170/WDE4360
RELEASED 04-08-97
4079-001045 Rev. B
42
Servo Burst - Provides positioning information to the actuator arm, usually positioned between
sectors or at the end of a track.
Single-ended SCSI - Standard electrical interface for SCSI. Single-ended means an interface
with one signal line and one corresponding ground line for each SCSI signal.
Soft Error - Data error that can be corrected by the error recovery process.
Ultra SCSI - Provides 20 MB/s over an 8-bit bus or 40 MB/s over a 16-bit Wide SCSI bus.
Known also as Fast-20 SCSI, this feature is most commonly found in SCSI-3 devices.
Unrecoverable Error - Read error that cannot be corrected by an ECC scheme or by re-reading
the data when host retries are enabled.
Zoned Recording - Increases the data density on the outer tracks of the drive where most of the
sectors are located. This type of recording affords more disk capacity because there can be more
sectors on the larger outer tracks than would be possible if the number of sectors per track were
constant for the whole drive.