Deskstar T7K500 Hard Disk Drive Specification
212
Note: After the power on reset or hard reset the device is set to the following features as default.
12.37.1 Set Transfer mode
When the Feature register is 03h (= Set Transfer mode) the Sector Count Register specifies the transfer mechanism.
The upper 5 bits define the type of transfer and the low order 3 bits encode the mode value.
12.37.2 Write Cache
If the number of auto reassigned sectors reaches the reassignment capacity of the device, the write cache function
will automatically be disabled. Although the device still accepts the Set Features command (with Feature register =
02h) without error, the write cache function will remain disabled. For the current write cache function status, refer
to (word 85 or 129) in Table 82: “Identify device information” on page 149.
12.37.3 Advanced Power Management
When the Feature Register is 05h (=Enable Advanced Power Management) the Sector Count Register specifies the
Advanced Power Management level.
The idle time to Low power idle mode and Low RPM standby mode vary according to the value in Sector Count
register as follows:
When Low power idle mode is the deepest Power Saving mode,
Write cache Enable
ECC bytes 4 bytes
Read look-ahead Enable
Reverting to power on defaults Disable
Release interrupt Disable
PIO Default Transfer Mode 00000 000
PIO Default Transfer Mode, Disable IORDY 00000 001
PIO Flow Control Transfer Mode x 00001 nnn (nnn=000,001,010,011,100)
Multiword DMA mode x 00100 nnn (nnn=000,001,010)
Ultra DMA mode x
01000 nnn
(nnn=000,001,010,011,100,101)
FFH Aborted
C0-FEh
The lowest Power Saving Mode is Normal Idle mode (the same as Dis-
able Advanced Power Management)
80-BFh The lowest power consumption mode is Low Power Idle
01-7Fh The lowest power consumption mode is Low RPM standby mode
00H Aborted
[sec]
y
1
=(x− 80h) 5+ 120 (120☯y
1
☯435)
(the device does not go to Low RPM standby mode)
y
2
=N/A
To Next Page
Loading...
Need help?
General