"Houston, we have problem..."

Running pkg_chk today, my home PC suddenly spat out the following in 
funky green text:

wd0a: error reading fsbn 969840 of 969840-969855 (wd0 bn 969903; cn 962 tn 3 sn 18), retrying
wd0: (uncorrectable data error)
wd0a: error reading fsbn 969840 of 969840-969855 (wd0 bn 969903; cn 962 tn 3 sn 18), retrying
wd0: (uncorrectable data error)
wd0a: error reading fsbn 969840 of 969840-969855 (wd0 bn 969903; cn 962 tn 3 sn 18), retrying
wd0: (uncorrectable data error)
wd0: transfer error, downgrading to Ultra-DMA mode 1
wd0(pciide1:0:0): using PIO mode 4, Ultra-DMA mode 1 (using DMA data transfers)
cd0(pciide1:0:1): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA data transfers)
wd0a: error reading fsbn 969840 of 969840-969855 (wd0 bn 969903; cn 962 tn 3 sn 18), retrying
wd0: (uncorrectable data error)
wd0a: error reading fsbn 969847 of 969840-969855 (wd0 bn 969910; cn 962 tn 3 sn 25), retrying
wd0: (uncorrectable data error)
wd0a: error reading fsbn 969847 of 969840-969855 (wd0 bn 969910; cn 962 tn 3 sn 25)wd0: (uncorrectable data error)

I interrupted pkg_chk, and no more message appeared. I put the system in
single-user mode, and it seems to be stable. The complete dmesg is at
http://bjan.net/nb/dmesg-2003-09-18.txt

Should I be buying a new hard-drive now? This one is not very old (i.e.
new enough to silently remap bad sectors) but it has had a hard life.

Finally, if I need to buy a new HD, do we support Serial ATA in 
-current?
-- 
Bruce J.A. Nourish <bjan+public@bjan.net> http://bjan.net