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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ATA: abnormal status 0x7F on port 0xD407
https://launchpad.net/bugs/84359

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