machan okata thawa method ekak tiyenawa. i think it lot easy.
Step 1 - Right click the my computer and click Manage & open Computer Management window
Step 2 - Then click disk management u will see all ur drives and partitions.
Step 3 - Then right click the partition u want to HIDE
Step 4 - Then click Change drive letter
Step 5 - Then click Remove
Thats all buddies
When u want to see the partition follow to the Step 4 and then click Add and assign a drive letter.