hesela.devSCSI LBPRZ
SCSI LBPRZ describes the logical data returned when unmapped block addresses are read.
Decode the representation: READ CAPACITY(16) has a one-bit indication, while the reviewed Logical Block Provisioning VPD page has a three-bit field. In that field, xx1b denotes zero data, 010b an initialization pattern and 000b device-specific data. A nonzero field therefore need not mean zeros. [1]
Relations
- related
- Deallocated read behavior, SCSI GET LBA STATUS, Logical block provisioning status, SCSI UNMAP, Data sanitization
Limitations
- A logical read contract is not proof that hidden physical copies were erased. [1]
Citations
Sources & caveats
- Scoped to the June 2022 reference manual, section 3.25.2 and Table 544; not a device measurement.