[Ti] Is there a trick to replacing a hard drive?

[Jerry Krinock]

We have a 867 MHz Ti.  The 40 GB hard drive was making noises and the system
was freezing.  Since we don't use this for much, I bought a 20 GB ATA hard
drive on eBay and replaced it.  Everything went together fine, but when I
boot off our Tiger install DVD and open Disk Utility to format the new
drive, it ain't there.  It's also not there in System Profiler > ATA.

Did I miss a step?  I've checked the connector twice to verify that I did
not offset any of the pins.

It is a Toshiba MK20118GAP, HDD2164.  It also says COMPAQ P/N 249493-001.

Did I get a bad hard drive?  Is the downsizing from 40 GB to 20 GB possibly
illegal?

Jerry