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11.37.2 Overwrite Ext Command (feature: 0014h)
Com m and Block Output Registers
Register
Data Low
Data High
Current
Feature
Previous
Current
Sector Count
Previous
Current
Sector Number
Previous
Current
Cylinder Low
Previous
Current
Cylinder High
Previous
Device/Head
Command
Error Register
7
6
5
4
CRC
UNC
0
IDN
V
Vs
0
V
Table 197 Overwrite Ext Command (B4h/0014h)
The OVERWRITE EXT command starts an overwrite operation (i.e., a sanitize operation on the internal media that
stores user data) which fills the user data area with a four byte pattern specified in the LBA field of the command.
Parameters for the OVERWRITE EXT command include a count for multiple overwrites and the option to invert the
four byte pattern between consecutive overwrite passes.
After the overwrite operation has been successfully applied, affected data blocks are readable without error.
The OVERWRITE EXT command only is processed if:
a) the Sanitize Device feature set is supported
b) the device is in the SD0: Sanitize Idle state, the SD3: Sanitize Operation Failed state, or the SD4: Sanitize
Operation Succeeded state.
7
6
5
4
3
2
-
-
-
-
-
-
-
-
-
-
-
-
0
0
0
1
0
1
0
0
0
0
0
0
V
-
-
V
V
V
V
-
-
-
-
-
-
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
0
1
0
1
0
1
V
V
V
V
V
V
V
0
1
0
0
1
1
1
1
1
D
-
-
1
0
1
1
0
1
3
2
1
0
ABT
T0N
0
V
0
Western Digital Hard Disk Drive OEM Specification
Com m and Block Input Registers
1
0
Register
-
-
Data Low
-
-
Data High
0
0
Error
0
0
V
Sector Count
-
-
V
Sector Number
V
V
Cylinder Low
1
1
V
Cylinder High
1
1
-
-
Device/Head
0
1
Status
0
7
6
AMN
BSY
RDY
0
0
V
226
7
6
5
4
-
-
-
-
-
-
-
-
...See Below ...
HOB=0
-
-
-
-
-
V
V
V
HOB=1
HOB=0
V
V
V
V V V V V
HOB=1
-
-
-
-
HOB=0
V
V
V
V V V V V
HOB=1
-
-
-
-
HOB=0
-
-
-
-
HOB=1
-
-
-
-
-
-
-
-
...See Below ...
Status Register
5
4
3
2
DF
DSC
DRQ
COR
0
V
-
0
3
2
1
0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
0
IDX
ERR
-
V
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