how to recover pen drive showing unknown capacity???

Requirements: A "corrupt" USB thumb/flash drive, and windows vista/7.

First of all, RESTART YOUR PC...(this is the only way it worked for me...hopefully it works the same for you)

1. Plug-in your USB flash drive to USB port.

2. Open Command Prompt with admin rights. Use any of the below methods to open Command Prompt.

*Type cmd in Start menu*

3. You need to know about the USB drive a little bit. Type in the following commands in the command prompt:

>>> First type DISKPART and hit enter to see the below message. (this opens the disk-partition manager)

>>> Next type LIST DISK command and note down YOUR FLASH DRIVE'S Disk number (eg: Disk 1). BE CAREFUL NOT TO CHOOSE YOUR PRIMARY HARD-DRIVE.

4. Next type all the below commands one by one. Here I assume that your disk drive no is “Disk 1”.If you have Disk 2 as your USB flash drive then use Disk 2.Refer the above step to confirm it.
So below are the commands you need to type and execute one by one:

SELECT DISK 1

CLEAN

CREATE PARTITION PRIMARY

SELECT PARTITION 1

ASSIGN

FORMAT FS=NTFS
(Format process may take few minutes)

EXIT

If you did everything exactly, then your USB drive should be goos as new.

(:::::: TeckGuru ::::::)

TeckGuru
March 2010

Right click My Computer, click 'Manage'. If it's listed see if you can format it.

whkrems
September 2009