While looking at an eSATA connected external disk with a medium error, this sense data appeared: READ cdb: 28 00 96 4a 7a d1 00 00 01 00 duration=2816 ms READ: Descriptor format, current; Sense key: Medium Error Additional sense: Unrecovered read error - auto reallocate failed Descriptor type: Information 0x00000000964a7ad1 Raw sense data (in hex): 72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00 96 4a 7a d1 That is pretty close to what I was expecting to see. If anything there is too much information. That "Unrecovered read error - auto reallocate failed" [asc/asq: 11h/04h] should just be "Unrecovered read error" [asc/asq: 11h/0h]. See sat2r09.pdf table 105 or sat3r00.pdf table 105. The problem seems to be in libata's SATL code in the sense_table[] in ata_to_sense_error() in libata-scsi.c . Looks like some other entries in that sense_table need adjusting as well to align them to SAT's table 105. Also it is good to have a reference comment as sense_data[] does in lk 2.6.35: /* Based on the 3ware driver translation table */ but this would be better (if it did comply): /* Based on table 105 in SAT-2 rev 9 */ Doug Gilbert -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html