Protection Information (Pi) And Security (Sed) - Seagate ST400FM0323 Product Manual

3.8.5

Protection Information (PI) and Security (SED)

The requirements in this section apply to any device which supports LBA unmapping.
In SCSI devices, umapped LBAs are defined as part of the Thin Provisioning model. Support of the Thin Provisioning model is
indicated by the LBPME bit having a value of '1' in the READ CAPACITY (16) parameter data.
When a region of LBA's are erased via cryptographic erase, as part of the erase, the drive shall unmap those LBAs.
If the host attempts to access an unmapped or trimmed LBA, the drive shall return scrambled data. For a given LBA, the data shall be
identical from access to access, until that LBA is either updated with actual data from the host or that LBA is cryptographically erased.
The drive shall report a value of '0' in the LBPRZ field returned in the READ CAPACITY (16) parameter data.
If the host attempts to access an unmapped LBA on a drive that has been formatted with Protection Information (PI), the drive shall
return scrambled PI data for that LBA. Depending on the value of the RDPROTECT field in the data-access command CDB, this may
result in the drive returning a standard PI error to the host.
If the host reduces the addressable capacity of the drive via a MODE SELECT command, the drive shall unmap or trim any LBA within
the inaccessible region of the device.
Additionally, an UNMAP command is not permitted on a locked band.
PI Setting
PROT_EN bit
LBPME bit
LBPRZ bit
PI Check Requested
DATA Returned for
Thin Provisioned LBA
PI Returned for
Thin Provisioned LBA
PI Check Performed
Error reported to Host
Seagate 1200.2 SAS SSD Product Manual, Rev. A
Drive Configuration
Standard
Disabled Enabled
0 1
1 1
1 1
N/A Yes No
0x00 0x00 0x00
None 0xFF 0xFF
N/A No No
No No No
SED and FIPS
Disabled Enabled
0 1
1 1
0 0
N/A Yes No
Random None Random
Scrambled
None None
PI data
N/A Yes No
No Yes No
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