sg_verify: version: 1.21 20140516

Usage: sg_verify [--16] [--bpc=BPC] [--count=COUNT] [--dpo] [--ebytchk=BCH] [--group=GN] [--help] [--in=IF] [--lba=LBA] [--ndo=NDO] [--quiet] [--readonly] [--verbose] [--version] [--vrprotect=VRP] DEVICE where: --16|-S use VERIFY(16) (def: use VERIFY(10) ) --bpc=BPC|-b BPC max blocks per verify command (def: 128) --count=COUNT|-c COUNT count of blocks to verify (def: 1). If BCH=3 then COUNT must be 1 . --dpo|-d disable page out (cache retention priority) --ebytchk=BCH|-E BCH sets BYTCHK value, either 1, 2 or 3 (def: 0). BCH overrides BYTCHK=1 set by '--ndo='. If BCH is 3 then NDO must be the LBA size (plus protection size if DIF active) --group=GN|-g GN set group number field to GN (def: 0) --help|-h print out usage message --in=IF|-i IF input from file called IF (def: stdin) only active if --bytchk=N given --lba=LBA|-l LBA logical block address to start verify (def: 0) --ndo=NDO|-n NDO NDO is number of bytes placed in data-out buffer. These are fetched from IF (or stdin) and used to verify the device data against. Forces --bpc=COUNT. Sets BYTCHK (byte check) to 1 --quiet|-q suppress miscompare report to stderr, still causes an exit status of 14 --readonly|-r open DEVICE read-only (def: open it read-write) --verbose|-v increase verbosity --version|-V print version string and exit --vrprotect=VRP|-P VRP set vrprotect field to VRP (def: 0) Performs one or more SCSI VERIFY(10) or SCSI VERIFY(16) commands. sbc3r34 made the BYTCHK field two bits wide (it was a single bit).