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9.20
Sanitize Device Feature Set
9.20.1
Overview
The Sanitize Device Feature Set allows hosts to request that devices modify the content of all user data areas in the
device using sanitize operations. Sanitize operations use one of the operations defined in this sub clause to make all
previously written content in the user data area of the device unable to be read. Sanitize operations affect the
following:
a) user data areas
b) user data areas that are not currently allocated (e.g., previously allocated areas and physical sectors that have
become inaccessible)
c) user data caches
Sanitize operations render user data previously stored in caches, using any methods, unable to be read.
The Sanitize Device feature set is implemented, the following commands are supported:
a) SANITIZE STATUS EXT
b) SANITIZE FREEZE LOCK EXT
c) CRYPTO SCRAMBLE EXT
d) OVERWRITE EXT
If physical sectors that have become inaccessible are not successfully sanitized, then Sanitize operations don't
cause a transition to the SD3: Sanitize Operation Failed state.
Sanitize operations don't affect non-user data areas (e.g., logs, and Device SMART data structure).
Sector reallocation is able to be performed during the operation of this function. After completion of a sanitize
operation, if:
a) all physical sectors that are available to be allocated for user data have been successfully sanitized
b) any physical areas that were not successfully sanitized were removed from use,
then:
a) the Sanitize Device state machine transitions to SD4: Sanitize Operation Succeeded; and
b) in subsequent SANITIZE STATUS EXT commands, set the SANITIZE OPERATION COMPLETED W ITHOUT
ERROR bit to one in the Normal Outputs
Conversely, if physical sectors that are available to be allocated for user data (e.g. allocated physical sectors) were
not successfully sanitized, then:
a) the Sanitize Device state machine transitions to SD3: Sanitize Operation Failed; and
b) in subsequent SANITIZE STATUS EXT commands, return an error and set the LBA field of the Error Outputs
to report the value of Sanitize Command Unsuccessful
To initiate a sanitize operation the host issues one of the following sanitize operation commands:
a) A CRYPTO SCRAMBLE EXT command
b) An OVERWRITE EXT command
The sanitize operation continues after command completion of the initiating sanitize operation command. The
SANITIZE STATUS EXT command to reports progress and completion.
After a device has started processing a sanitize operation, and until the device transitions to the SD0:
Sanitize Idle state, the device aborts all commands other than:
a) IDENTIFY DEVICE command
b) IDLE IMMEDIATE command with UNLOAD feature
c) Request Sense Data Ext command;
d) SANITIZE STATUS EXT command;
e) SMART READ LOG command requesting log address E0h;
f)
READ LOG EXT command requesting one of the following log addresses:
A) E0h;
Western Digital Hard Disk Drive OEM Specification
95
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