After burning 3 DVD's, and reading them back to compute sha256sum.
all three of them generated these error messages during readback,
and all 3 messages show the error was past the 4gb offset.
Is this a media issue or is it the burner?
A side question: why does the block io layer assume that all media
have 512 byte sectors?
[ 977.862167] sr 1:0:0:0: [sr0] FAILED Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
[ 977.862175] sr 1:0:0:0: [sr0] Sense Key : Medium Error [current]
[ 977.862179] sr 1:0:0:0: [sr0] Add. Sense: Unrecovered read error
[ 977.862182] sr 1:0:0:0: [sr0] CDB:
[ 977.862186] Read(10): 28 00 00 22 33 38 00 00 40 00
[ 977.862197] blk_update_request: I/O error, dev sr0, sector 8965376
[ 981.369440] sr 1:0:0:0: [sr0] FAILED Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
[ 981.369448] sr 1:0:0:0: [sr0] Sense Key : Medium Error [current]
[ 981.369452] sr 1:0:0:0: [sr0] Add. Sense: Unrecovered read error
[ 981.369455] sr 1:0:0:0: [sr0] CDB:
[ 981.369458] Read(10): 28 00 00 22 33 78 00 00 40 00
[ 981.369471] blk_update_request: I/O error, dev sr0, sector 8965600
[ 986.544988] sr 1:0:0:0: [sr0] FAILED Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
[ 986.544996] sr 1:0:0:0: [sr0] Sense Key : Medium Error [current]
[ 986.545000] sr 1:0:0:0: [sr0] Add. Sense: Unrecovered read error
[ 986.545024] sr 1:0:0:0: [sr0] CDB:
[ 986.545027] Read(10): 28 00 00 22 33 70 00 00 02 00
[ 986.545043] blk_update_request: I/O error, dev sr0, sector 8965568
[ 986.545051] Buffer I/O error on dev sr0, logical block 1120696, async
page read
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