Set Features Command (Ef H ) - Seagate Medalist 1640 Product Manual

Medalist 1640 and 2140 Product Manual, January 1996
Word Description
Minimum PIO
67
transfer without
IORDY
Minimum PIO
68
transfer with IORDY
Reserved
69--127
Seagate-reserved
128--159
160-- 255 Reserved
3.2.2 Set Features command (EF
The Set Features command (command code EF
enable and disable the multisegmented cache features and to identify
the transfer modes the drive uses. The multisegmented buffer consists
of Read look-ahead and write-immediate and write-merging features.
The table below lists the features the drives support. The features that
are set to default by the factory are indicated in the Feature column.
Feature Value Feature
02 Enable write cache (default)
H
03 Set transfer mode
H
04 Enable Read Auto Relocation (default)
H
Uses 22 bytes of ECC on read long and write long
44
H
commands
55 Disable read look ahead cache
H
82 Disable write cache
H
84 Disable Read Auto Relocation
H
AA Enable read look-ahead (default)
H
Uses 4 bytes of ECC on read long and write long
BB
H
commands (default)
Value
180 nsec
120 nsec
xxxx
H
xxxx
H
xxxx
H
)
H
) allows the user to
H
31