On Sat, Mar 12, 2011 at 08:10:51PM -0600, Robert Hancock wrote:

quoted

I dont know why there is "[    2.098493] ata4.00: failed command: READ FPDMA QUEUED" in dmesg.

I have 3 WD Green 1TB HDD, and I samsung 160GB HDD.
1 SAMSUNG and 1 WD on the intel SATA,
2 WD on the GIGABYTE Sata.
I think the problem is only with the gigabye sata port.

That's an uncorrectable read error the drive is reporting. Most
likely that hard drive is failing.

Or maybe just a bad sector, in which case just writing it over would
cause the drive to reallocate the failed region.  I think this
partial/transient failure mode is much more common than the whole
drive going south.

Thanks.

-- 
tejun