GoldeNaija

SOMETIME YOUR DISK/ FLASHDRIVE OR MEMORY CARD LOSES IT ORIGINAL SPACE 
The problem is that the remaining
space of your USB flash disk has
become unallocated. To repair it,
use diskpart (in windows):
Open command line (cmd) and
type diskpart. Allow the
windows to run it.
type list disk, and find the
number of your USB flash disk.
type select disk X, and
type the number of the USB
disk instead of X.It should say
that disk X is now selected.
type clean.
type create partition
primary.
Now you should be able to use the
flash disk as before. (You have to
format it first)

HOW TO FORMAT A STUBBORN USB/ FLASH DRIVE

You have this flashdrive that looks corrupted, unable to format and those problems that occurs with a drive just follow the steps bellow 

For USB drives:

1. Open Start -> Run...
2. type diskmgmt.msc and press enter
3. right click on the partition you want to format (where the letter and size is)
4. select 'Delete Partition...' and confirm
5. right mouse button in the same place and select 'Create partition'
6. select primary partition
6. select size, file forma, disk letter, label etc should be all right if you leave defaults.
7. click ok

This will recreate the partition and format it in proper way. Helped me and will help to most of you if you have problem with MBR.

\

THAT SHOULD DO