Since I have recently moved, I’ve discovered how much I hate devices that don’t clearly label their power supplies. All my wall warts got detached from their devices in the move, and I’m gradually re-unifying them.
Today’s example: the Maxtor Shared Storage II 320 G external drive. It takes 12 volts DC, 3A, centre positive, and a brick I had from Goodwill with a 5.5mm outer barrel connector seemed to fit well.