I have two Maxtor One Touch III 500 gb external USB/Firewire drives. One on MAC, one on Windows XP.
The XP Maxtor was having a connection problem. It was not being sensed by the USB or Firewire busses. It would continually blink, but was not addressable.
I exchanged the DVE DC converter, part number DSA-36W-12 30 B with my other, working, DC converter and
the drive came right up!
When the suspect DC converter was moved to the MAC system, the drive on the MAC would not mount.
I would suggest replacing the DC converter DSA-36W-12 30 B if you want to resurrect your external Maxtor One Touch III. I purchased a new one on ebay for $20.00 including shipping. Works great.