Set Maximum Host Interface Sector Time - Hitachi HDS723020BLA642 Specifications

Y =(x-40h) * 60 + 600[sec]
2
When Low RPM idle mode is the deepest Power Saving mode and the value in Sector Count register is between
01h and 3Fh,
120<=Y <=435 [sec] (default: 120 [sec])
1
Y =600 [sec]
2
where x is the value in Sector Count register, y
to Low RPM idle mode.
If Low power idle mode has already been enabled (i.e., y
y is preserved. If Low power idle mode is disabled (i.e., y
1
Low RPM idle mode is enabled.
Enabled Power Saving mode and idle time (y
disabled, the deepest Power Saving mode becomes Normal Idle mode, or new time is set. They are initialized
with a hard/soft reset unless Reverting to power on defaults is disabled and the device receives a soft reset.
11.38.4.1
Low Power Idle mode
Additional electronics are powered off, and heads are unloaded on the ramp, however the spindle is still rotated
at the full speed.
11.38.4.2
Low RPM idle mode
The heads are unloaded on the ramp, and the spindle is rotated at the 60-65% of the full speed.
When Feature register is 85h (=Disable Advanced Power Management), the deepest Power Saving mode
becomes normal Idle.

11.38.5 Set Maximum Host Interface Sector Time

Sector Count Typical PIO Mode Host Interface Sector Time (7:0)
LBA Low Typical PIO Mode Host Interface Sector Time (15:8)
LBA Mid Typical DMA Mode Host Interface Sector Time (7:0)
LBA High Typical DMA Mode Host Interface Sector Time (15:8)
Subcommand code 43h allows the host to inform the device of a host interface rate limitation. The typical Host
Interface Sector Times have the same units as Identify Device word 96 for DMA and word 104 for PIO. A value of
zero indicates that the host interface shall be capable of transferring data at the maximum rate allowed by the
selected transfer mode. The Typical PIO Mode Host Interface Sector Time includes the host‟s interrupt service
time.
(600<=Y <=4380)
2
is the idle time to Low Power Idle mode, and y
1
has been set) before Low RPM idle mode is enabled,
1
1
and y ) are preserved until Advanced Power Management is
1 2
Hitachi hard disk drive specifications
197
has not been set yet), y
1
is the idle time
2
becomes 120[sec] when