I have the exact same problem with dell 700m 160 GB samsung PATA drive.
After resume dmesg has the exact same pattern as reported earlier

<snip>
ata1: device not ready (errno=-16), forcing hardreset
<post>

I recompiled 2 versions of 2.6.28.9 vanilla kernel so that I get drives 
as /dev/hda* with one and /dev/sda* with another. I am getting the EXACT 
same behavior with ALL kernels. Also, I used libata.noacpi=1 when drives
are mounted as /dev/sda* but did not change the behavior. The drive was
fine till I upgraded to Jaunty.

-G

Ritesh Raj Sarraf wrote:
> I had suspected this. I'm not sure though whether it is a bad hardware
> of a suspend bug.
> 
> LMT, by itself, doesn't do much. Usually if there's an LMT bug, a simple
> ON_AC => ON_BAT => ON_AC will be able to trigger it.
> 
> I'd suggest you first do a full backup of your data. And then try with
> different kernels to be sure about whether it is a kernel (suspend) bug
> or a hardware bug.
>

-- 
Harddisk stops working after wakeup
https://bugs.launchpad.net/bugs/358943
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