Hi, The hard disk with model num: "HITACHI HTS541616J9SA00" model rev: "SB4IC7UP" is causing NCQ errors and should be blacklisted. Currently the blacklist for Hitachi hard disks includes { "HITACHI HDS7250SASUN500G*", NULL, ATA_HORKAGE_NONCQ }, { "HITACHI HDS7225SBSUN250G*", NULL, ATA_HORKAGE_NONCQ }, ... /* Blacklist entries taken from Silicon Image 3124/3132 Windows driver .inf file - also several Linux problem reports */ { "HTS541060G9SA00", "MB3OC60D", ATA_HORKAGE_NONCQ, }, { "HTS541080G9SA00", "MB4OC60D", ATA_HORKAGE_NONCQ, }, { "HTS541010G9SA00", "MBZOC60D", ATA_HORKAGE_NONCQ, }, http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob_plain;f=drivers/ata/libata-core.c;hb=HEAD The same hard disk causing NCQ errors to different users, http://www.nabble.com/hdparm--B-1-and-Load_Cycle-on-Hitachi-HTS541616J9SA00-td14702758.html https://bugs.edge.launchpad.net/ubuntu/+source/linux-source-2.6.22/+bug/137470 Could you please add the entry { "HITACHI HTS541616J9SA00", NULL, ATA_HORKAGE_NONCQ, }, Simos - 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