Seagate Medalist 1640, Руководство по эксплуатации продукта

Страница: 42 / 48

whenever the drive is in Active mode. The drive is shipped with the timer
disabled.
3.2.4 Active and Set Idle Timer command (FB
H
)
This is a Seagate-unique power command. It moves the drive immedi-
ately to Active mode. When the drive receives this command, it asserts
Busy in the Host Status register, initiates entry into Active mode, negates
Busy and generates an interrupt. If the drive is in Standby mode, it does
not wait for the spinup to complete before issuing the interrupt.
The command also allows the host to set a timer, the Idle timer, that
causes the drive to move to Idle mode if no drive activity occurs within
the allotted time. The timer is set using the Sector Count register. The
register values correspond to 100-msec increments with a maximum
programmable time of 25.5 seconds. A zero value in the Sector Count
register disables the timer. If this value is set, the Idle timer is enabled
whenever the drive is in Active mode. The drive is shipped with the timer
disabled.
3.2.5 Read Autorelocation
This feature allows the drive to identify grown media defects and to
reallocate the sector without host intervention.
This feature is disabled if the retries are disabled in the Read command
or Write command. Also, the feature is not implemented for the Read
Long or Write Long commands.
34 Medalist 1640 and 2140 Product Manual, January 1996