I have this problem too with hardy on a EPIA CX, showing the following repeated 
in dmesg:
====
[216585.546939] ata4.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2
[216585.546984] ata4.00: BMDMA stat 0x25
[216585.547020] ata4.00: cmd 25/00:08:57:c0:14/00:00:23:00:00/e0 tag 0 dma 4096 
in
[216585.547026]          res 51/84:08:57:c0:14/84:00:23:00:00/e0 Emask 0x10 
(ATA bus error)
[216585.547064] ata4.00: status: { DRDY ERR }
[216585.547087] ata4.00: error: { ICRC ABRT }
[216585.547121] ata4: soft resetting link
[216585.570275] ata4.00: configured for UDMA/33
[216585.570303] ata4: EH complete
[216585.576856] sd 3:0:0:0: [sdc] 781422768 512-byte hardware sectors (400088 
MB)
[216585.576890] sd 3:0:0:0: [sdc] Write Protect is off
[216585.576899] sd 3:0:0:0: [sdc] Mode Sense: 00 3a 00 00
[216585.576938] sd 3:0:0:0: [sdc] Write cache: enabled, read cache: enabled, 
doesn't support DPO or FUA
====

There are 2 SATA disks in RAID1. The system boots from a PATA flash
module. I have tried changing the SATA cables to branded ones but the
above messages remain.

-- 
SATA HDD on VIA Epia EX crashes and lockups
https://bugs.launchpad.net/bugs/238368
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