How to recover a missing Hard Disk Partition in Windows 7

1. Click Start Menu.
2. Type diskmgmt.msc in the search bar, then click the diskmgmt program.
3. Right click on the Partitioned Hard Disk that is missing.
4. Select Change Drive Letter and Paths... .
5. A Pop-Up window will appear, click Add a Pop-Up window will appear again and choose a drive letter you want in the pull down menu.
6. Click Ok to assign selected driver letter, and check your My Computer if it did fixed the problem.

Tip: You can press the Windows Logo in your keyboard, plus the letter "E" in the keyboard to open the My Computer Window.