K6610170
Rev.2
Dec 22, 2004
- 106 -
7.5.45. SMART Enable/Disable Automatic Off-line [B0h, Sub DBh]
Task
File
Registers
7 6 5 4 3 2 1 0
Command B0h
LBA High
C2h
LBA Mid
4Fh
LBA Low
XX
Device/Head
X X X
DRV
X X X X
Sector Count
00h: Disable, F8h: Enable
Features
DBh
SMART ENABLE / DISABLE AUTOMATIC OFF-LINE command enables and disables the Automatic Off-line
feature. if Automatic Off-line is enabled, the device automatically correct attribute data in an off-line mode
periodically and save the attribute data on the disk.
- The Sector Count Register is set to 00h to disable Automatic collection of Off-line data
-
The Sector Count Register is set to F8h to enable Automatic collection of Off-line data
The following tests are performed for the Automatic off-line feature:
a) Raw Read Error Rate Measurement
Partial read scanning and Raw Read Error Rate measurement is performed.
This event is occurred every 24 POH’s and 2 minutes of host inactivity.
b) Automatic sector reallocation in off-line read scanning for entire LBA.
This event occurs every 168 POH’s and 2 minutes of host inactivity.
Enable state is preserved until receiving a disable automatic off-line command. Upon receipt of the SMART
Enable/Disable automatic Off-line command, the device sets BSY to one, enables or disables the automatic
off-line data correction feature, clear BSY to zero and asserts INTRQ. During execution of its off-line data
collection activities and saving the data on the disk, DRDY and BSY are set to zero. A command is issued
during execution of its off-line data collection activities and saving the data on the disk, the device will
respond to the host within two seconds.