IDE hdd timeout

Hi,

I am running a 5.2.1-RELEASE router/firewall and I am getting messages
such as:
ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=7593671
ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=10216223
ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=9099251
ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=10592607
ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=7206207

In 13 days of uptime I have got 13 similar messages in dmesg, and no, I am 
not getting them at a constant rate.
The box has almost no load on it's hard drives.

I though I would just report it, maybe it is useful to someone.

For further information I am also including some more output from dmesg:

atapci0: <SiS 962/963 UDMA133 controller> port
0x4000-0x400f,0x374-0x377,0x170-0x177,0x3f4-0x3f7,0x1f0-0x1f7 at device
2.5 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata0: [MPSAFE]
ata1: at 0x170 irq 15 on atapci0
ata1: [MPSAFE]

GEOM: create disk ad0 dp=0xc2906e60
ad0: 9671MB <IBM-DTTA-351010> [19650/16/63] at ata0-master UDMA33

--
Kalev Lember