Failed SATA array (/dev/md0) - How to tell which SATA drive is "/dev/sdd"

[Steve Kratz]

/proc/mdstat shows that sdd1 dropped out of my array, and I'm at a loss
as to which of the five drives in this box is the bad one.

I have two Promise FastTrack S150 controllers in the server, 5 drives
total.

I know hdparm can show the s/n of a standard IDE hard drive - is there
anything for SATA drives? (hdparm reports that it can't do anything with
SCSI drives).

TIA!

Steve