Deskstar 7K80 Hard Disk Drive Specification
195
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 86: “Identify device information (Part 1 of 7)” on page 136.
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
−
80
h
)
5
+
120
(
120
☯
y
1
☯
435
)
(the device does not go to Low RPM standby mode)
y
2
=
N/A
Summary of Contents for Deskstar 7K80
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Page 21: ...Deskstar 7K80 Hard Disk Drive specification 17 Part 1 Functional specification ...
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