I had a bunch of these, but my disk actually died:

    [440525.460000] ata2.00: configured for UDMA/33
    [440525.460000] ata2: EH complete
    [440942.908000] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 
frozen
    [440942.908000] ata2.00: cmd a0/01:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 
0x43 data 12 in
    [440942.908000]          res 50/00:01:00:00:00/00:00:00:00:00/a0 Emask 0x2 
(HSM violation)
    [440942.908000] ata2: soft resetting port

This is on an up-to-date Feisty system.  I noticed because all of a
sudden I couldn't write to the disk, and on fsck, it basically dumped
everything and I lost everything (luckily, I have good backups).  So...
is this a problem with Ubuntu corrupting disks, or did my disk die?

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strange messages "ata3.00: exception Emask (HSM violation)"
https://bugs.launchpad.net/bugs/163637
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