I have the same problem with my macbook pro. ATA: abnormal status 0x7F on port 0x40CF ATA: abnormal status 0x7F on port 0x40CF ATA: abnormal status 0x7F on port 0x40CF ata1.01: qc tmieout (cmd 0x27) ata1.01: faild to set xfermode (err_mask=0x40) ata1.01: limiting speed to PIO0 ata1: faild to recover some devices, retrying in 5 secs ATA: abnormal status 0x7F on port 0x40CF ATA: abnormal status 0x7F on port 0x40CF ATA: abnormal status 0x7F on port 0x40CF ata1.01: qc tmieout (cmd 0x27) ata1.01: faild to set xfermode (err_mask=0x40) ata1.01: disabled scsi1 : ata_piix ATA: abnormal status 0x7F on port 0x40C7 hda: ATAPI 24x DVD-ROM DVD-R CD-R/RW drive, 2048kB Cache, UDMA(33) Uniform CD-ROM driver Revison 3.20
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