Probably no great point in that. FDISK cannot usually see an ST-506/412 interface HD that has not been low level formatted on the controller in use at the time. Set the switch for the appropriate cable, and power up the computer. Bring up DEBUG and at the '-' prompt, enter DC800:0<CR>. If you see ASCII text that indicates that you are looking at a WD controller, then enter G=C800:5 and follow the prompts to low level format the disk. If this is successful - if the disk is good - then FDISK should see it on the next bootup and you can go on from there. If it is not successful, you probably have a bad HD. Also, if your DC800:0 search does not yield ASCII, try other addresses in 200H increments. That is, such as CA00:0, CC00:0, etc.