Error in messages.

[Derrick MacPherson]

I started seeing this today:

Feb  4 07:00:00 mail /kernel: (da1:ahc0:0:2:0): READ(10). CDB: 28 0 2 c 1 5f
0 0 10 0 
Feb  4 07:00:00 mail /kernel: (da1:ahc0:0:2:0): MEDIUM ERROR info:20c0168
asc:11,0
Feb  4 07:00:00 mail /kernel: (da1:ahc0:0:2:0): Unrecovered read error
sks:80,35

I umounted the disk, dumped it's contents to a spare disk.

Can you suggest some tests for this drive, or should I just get it replaced?