have the same problem recently.
ubuntu11.04 natty
Linux enet 2.6.38-8-server #42-Ubuntu SMP Mon Apr 11 03:49:04 UTC 2011 x86_64 
x86_64 x86_64 GNU/Linux
name    WDC WD3200AAJS-00L7A0
size    320 GB
speed   7200 r/m
cache   8 MB
interface       SATA Rev 2.5
transrate       300 MB/s
feature S.M.A.R.T,  48-bit LBA,  NCQ
[ 5216.002643] ata1: soft resetting link
[ 5216.180056] ata1.01: NODEV after polling detection
[ 5216.180062] ata1.01: revalidation failed (errno=-2)
[ 5221.160032] ata1: soft resetting link
[ 5221.380820] ata1.00: configured for UDMA/133
[ 5221.420145] ata1.01: configured for UDMA/100
[ 5221.420940] ata1: EH complete
[ 5276.002197] ata1.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[ 5276.002205] ata1.01: ST_FIRST: !(DRQ|ERR|DF)
[ 5276.002212] sr 0:0:1:0: CDB: Get event status notification: 4a 01 00 00 10 
00 00 00 08 00
[ 5276.002233] ata1.01: cmd a0/00:00:00:08:00/00:00:00:00:00/b0 tag 0 pio 16392 
in
[ 5276.002236]          res 00/00:00:00:08:00/00:00:00:00:00/b0 Emask 0x2 (HSM 
violation)
[ 5276.002249] ata1: soft resetting link
[ 5276.170183] ata1.01: NODEV after polling detection
[ 5276.170189] ata1.01: revalidation failed (errno=-2)
[ 5281.170031] ata1: soft resetting link
[ 5281.410467] ata1.00: configured for UDMA/133
[ 5281.450172] ata1.01: configured for UDMA/100
[ 5281.450991] ata1: EH complete
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https://bugs.launchpad.net/bugs/285892

Title:
  ata1.00: exception Emask 0x0 SAct 0x807f SErr 0x0 action 0x6 frozen

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