Alan, >> [ 77.474632] sd 0:0:0:0: [sda] tag#0 UNKNOWN(0x2003) Result: >> hostbyte=0x00 driverbyte=0x08 cmd_age=0s >> [ 77.474647] sd 0:0:0:0: [sda] tag#0 Sense Key : 0x6 [current] >> [ 77.474655] sd 0:0:0:0: [sda] tag#0 ASC=0x28 ASCQ=0x0 >> [ 77.474667] sd 0:0:0:0: [sda] tag#0 CDB: opcode=0x28 28 00 00 00 60 >> 40 00 00 01 00 > > This error report comes from the SCSI layer, not the block layer. This the device telling us that the media (SD card?) has changed. -- Martin K. Petersen Oracle Linux Engineering