Hello,
For as long as I have had my unRAID server I have had the following logged against two unassigned volumes.
Apr 22 12:24:30 Tower kernel: sd 1:0:0:0: [sdb] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08
Apr 22 12:24:30 Tower kernel: sd 1:0:0:0: [sdb] tag#0 Sense Key : 0x5 [current]
Apr 22 12:24:30 Tower kernel: sd 1:0:0:0: [sdb] tag#0 ASC=0x20 ASCQ=0x0
Apr 22 12:24:30 Tower kernel: sd 1:0:0:0: [sdb] tag#0 CDB: opcode=0x85 85 06 20 00 00 00 00 00 0