Standby (E2H/96H) - Hitachi T7K250 - Deskstar - Hard Drive Specifications

12.44 Standby (E2h/96h)

Table 138: Standby (E2h/96h)
Command Block Output Registers
Register
Data
Feature
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
Error Register
7 6 5
CRC UNC 0
0 0 0
The Standby command causes the device to enter the Standby Mode immediately and to set the auto power down
time-out parameter (standby timer).
When the Standby mode is entered, the drive is spun down but the interface remains active. If the drive is already
spun down, the spin down sequence is not executed.
During the Standby mode the drive will respond to commands but there is a delay while waiting for the spindle to
reach operating speed.
The automatic power down sequence is enabled and the timer starts counting down when the drive returns to Idle
mode
Output parameters to the device
Sector Count Time-out Parameter. If it is 0, the time-out interval (Standby Timer) is NOT disabled. If it is non-
zero, the automatic power down sequence is enabled. The time-out interval is shown below.
When the automatic power down sequence is enabled, the device will enter the Standby mode
automatically if the time-out interval expires with no device access from the host. The time-out
interval will be reinitialized if there is a drive access before the time-out interval expires.
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - - -
V V V V V V V V
- - - - - - - -
- - - - - - - -
- - - - - - - -
1 - 1 D - - - -
1 1 1 0 0 0 1 0
4 3 2 1
IDN 0 ABT T0N AMN
0 0 V 0
Value
0
1-240
241-251
252
253
254
255
Deskstar T7K250 Hard Disk Drive Specification
Command Block Input Registers
Register
Data
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
0 7 6 5
BSY RDY DF DSC DRQ
0 0 V 0
Time-out
Timer disabled
Value x 5 seconds
(Value-240) x 30 minutes
21 minutes
8 hours
21 minutes 10 seconds
21 minutes 15 seconds
213
7 6 5 4 3 2 1 0
- - - - - - - -
see below
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
see below
Status Register
4 3 2 1
COR IDX
V - 0 -
0
ERR
V