I have a hard drive that I reformatted. It is being used to hold only data ie, pictures, documents, etc. I removed it from the original computer and installed it in another computer. The new computer sees the hard drive in the bios, in control panel's device manager, tweak ui, even under My Computer_manage disks dialog box, it does not show up under my computer though and cannot be read. It does power up.
Start up the Disk Management tool (Start -> Right-click "Computer", select "Manage" -> click "Disk Management" in the left pane.
Find your drive in the LOWER portion of the right pane. What does it show there? If it shows as unallocated space then you need to right-click it to and partition and format the drive. If it shows as a formatted partition but without a drive letter then you need to right-click it and assign a drive letter.