First I would have my friend copy all your pictures to CD
Did you update the disk information on your computer?
This is a slave drive right?
To update disk information open Computer Management (Local).
On the Action menu, click Rescan Disks.
You must be logged on as an administrator or a member of the Administrators group in order to complete this procedure. If your computer is connected to a network, network policy settings may also prevent you from completing this procedure.
If your disk configuration has changed, but the changes do not appear in Disk Management, use the Rescan Disks command.
When Disk Management rescans disks, it scans all attached disks for disk configuration changes. It also updates information on removable media, CD-ROM drives, basic volumes, file systems, and drive letters.
Rescanning disks can take several minutes, depending on the number of hardware devices installed.