Sounds to me like there is drive letter associated with the drive in question.
To solve this, bring up your run command (windows logo key + r)
Then type MMC and press enter. Go to File and choose add snap in. In the next menu select Disc managment. Press add, and enter to get back to your console. After every thing loads, look for your drive. Right click it if its there and select change drive letter or path. Now yuo can select a letter for your drive.
If its not there, go to Action at the top of console and select rescan disks. this will often force windows to redetect any mssing drives.
I hope this helps.