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From: Justin Piszcz <jpiszcz@lucidpixels.com>
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To: Sander <sander@humilis.net>
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Subject: Re: LibPATA code issues / 2.6.15.4
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Look at this:

>>From smartctl, look at the correspondence:
199 UDMA_CRC_Error_Count    0x000a   200   253   000    Old_age   Always 
-       4

[4301946.802000] ata4: translated ATA stat/err 0x51/04 to SCSI SK/ASC/ASCQ 
0xb/00/00
[4301946.802000] ata4: status=0x51 { DriveReady SeekComplete Error }
[4301946.802000] ata4: error=0x04 { DriveStatusError }
[4302380.482000] ata4: translated ATA stat/err 0x51/04 to SCSI SK/ASC/ASCQ 
0xb/00/00
[4302380.482000] ata4: status=0x51 { DriveReady SeekComplete Error }
[4302380.482000] ata4: error=0x04 { DriveStatusError }
[4302493.664000] ata4: no sense translation for status: 0x51
[4302493.664000] ata4: translated ATA stat/err 0x51/00 to SCSI SK/ASC/ASCQ 
0xb/00/00
[4302493.664000] ata4: status=0x51 { DriveReady SeekComplete Error }
[4302863.673000] ata4: no sense translation for status: 0x51
[4302863.673000] ata4: translated ATA stat/err 0x51/00 to SCSI SK/ASC/ASCQ 
0xb/00/00
[4302863.673000] ata4: status=0x51 { DriveReady SeekComplete Error }

different drive, different cable, same controller, but second port

So that Stat/err = UDMA_CRC_Error_Count!

Not sure if we can fix what is causing it (in Linux) but just FYI.