In my IBM xSeries server, I have a 3Ware 9550SX 8 port SATA2 RAID card with two 80 GB SATA2 drives in RAID1.  One of the drives died last night during the nightly verify, and I received an email: "Jan 05, 2008 12:10.39AM (0x04:0x000A): Drive error detected: port=0, unit=0"

I went to Canada Computers this morning and purchased a Seagate 7200.10 160GB (ST3160815AS) drive.  Pulled the drive out of the simple-swap slot, removed the 4 screws and put the new drive in.  The 3Ware card started rebuilding.

Painless.  Simple.  Fast.  It's already 32% done rebuilding.