Recovering Unallocated Space of a Pen Drive.

Sometimes,when you format your pen drive your pen drive's memory may decrease, The lost memory is called unallocated memory to regain it back go to run in start menu and type cmd and press enter, This should open command prompt there type diskpart and hit enter next type list disk, you should get the list of drives connected (including hardisk) to your PC/Laptop. Now Usually the removable drive will be disk 1 so type select disk 1, If disk 1 isn't your Pen drive type appropriate disk number and hit enter, type clean to clean all the partitions and volumes, now give the command create partition primary and hit enter to restore your pen drive space back to normal.