same thing happens here on a OCZ Vertex 3 with Asrock 770 Extereme 3 board. the 
system randomly freezes for a couple of seconds and then I see errors in the 
log.  
...
ata6.00: exception Emask 0x0 SAct 0x1fffff SErr 0x0 action 0x6 frozen
ata6.00: failed command: READ FPDMA QUEUED
ata6.00: cmd 60/08:00:d0:d4:e6/00:00:00:00:00/40 tag 0 ncq 4096 in
res 40/00:01:00:00:00/00:00:00:00:00/e0 Emask 0x4 (timeout)
...
and so on

I'm using Precise upgraded on 26.04.2012 - kernel 3.2.0-23-generic-pae.
y

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https://bugs.launchpad.net/bugs/550559

Title:
  hdd problems, failed command: READ FPDMA QUEUED

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