What are these ata errors?

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Yesterday I cloned my old system disk (250Gb WD) to a new disk of same
size and manufacturer, using dd:

dd if=/dev/sdb of=/dev/sda

The process seemed to go well, but now when I look at dmesg I see the
below messages.  What do they mean?  My old drive doesn't show these.


SCSI device sda: 488397168 512-byte hdwr sectors (250059 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
SCSI device sda: 488397168 512-byte hdwr sectors (250059 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
ata3.00: tag 0 cmd 0xb0 Emask 0x1 stat 0x51 err 0x4 (device error)
ata3: EH complete
ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
ata3.00: tag 0 cmd 0xb0 Emask 0x1 stat 0x51 err 0x4 (device error)
ata3: EH complete
ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
ata3.00: tag 0 cmd 0xb0 Emask 0x1 stat 0x51 err 0x4 (device error)
ata3: EH complete
ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
ata3.00: tag 0 cmd 0xb0 Emask 0x1 stat 0x51 err 0x4 (device error)
ata3: EH complete
ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
ata3.00: tag 0 cmd 0xb0 Emask 0x1 stat 0x51 err 0x4 (device error)
ata3: EH complete
ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
ata3.00: tag 0 cmd 0xb0 Emask 0x1 stat 0x51 err 0x4 (device error)
ata3: EH complete

I see a similar set of messages for my old IDE hard drive that is also
in the computer, but was not involved in the upgrade.


Thanks,
Dan


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