"ad2: TIMEOUT - READ_DMA retrying (2 retries left) LBA=5855"

[bsdfsse]

I reinstalled the latest, 5.3-Beta6.  When I let the machine sit, then I 
do a "ls /mnt/ad2" I get the message:

"ad2: TIMEOUT - READ_DMA retrying (2 retries left)  LBA=5855"

When I reboot via "reboot", I get

"ad2: TIMEOUT - WRITE_DMA retrying (2 retries left)  LBA=xxxx" (where 
xxxx is some other number)

This only affects my 2nd and 3rd HD. They are Maxtor 200GB ATA drives.

Any suggestions?

thx!