The warning I may have issued to you is that if the drive was prepared with Disk Manager, EZDrive or any drive extender, then what you are seeing will happen.
It is not the "old FAT system" or it would be showing up as a drive letter.
To fix this, you have to identify what tool was used to prepare the drive. I would have guessed what that was IF you had noted the make/model of the drive. After that, you research about that tool and how to remove the drive extender.
This is actually a followup to "hot start a harddrive" I have installed my second hard drive in line with the original one for the computer. This worked fine on my old system. There is no way to autodetect in my bios--Dell does not allow this. I can find my hard drive under computer management but there is no drive letter next to it nor can I access anything on it. It says that the drive is "healthy" and I have tried to rescan the drive. It is under the old FAT system whereas now I am running XP as opposed to 98. Thankyou for the last reply.