I was installing win xp again on my computer.SO firstly I did the partitioning of space in the hard drive.But I forgot to detach my pen drive..and during partitioning we initially make unpartion space.My pendrive was also attached with the computer and so i also made the 1gb partition as unpartioned. The unpartitioned space of pendrive can be viewed separately..

Now after I installed win xp successfully..and after that i attached my pen drive with it again..then it shows in f: and when i click on it...th emessage comes : - "Please insert disc in drive F: ..and when i try to format my pen drive..then it is showing pen drive with unknown capacity...and it's unable to format it also...

Kindly help me to recover it...I would be very grateful to u..

Barjinder, February 2008

Thank you, you saved me from having to send my drive to geek squad to have it fixed

Noah Ater, April 2018

Add me as yet another satisfied TechGuru follower!

Recovered my 64gb flash drive!

jkefalas, October 2016

my USB is sandisc 32 GB unknown capacity d'not formate

rohite, August 2016

This is useful for me. My pen drive is working now.

Thank you very much

Regards: Saahil

Saahil, May 2016

thaku buddy,it really worked like charm....

girish, February 2015

it's FIXED !! thanks alot
my USB is HP 4GB ,lasttime i install Uniboot for DOS that's why i guess

Dalton, February 2014

Download This And format your drive with the software

http://www.softpedia.com/get/System/Hard-Disk-Utils/HP-USB-Disk-Storage-Format-Tool.shtml

I had the exact problem... that's how I fixed it.

Once UpOn A Time..., January 2014

For TeckGuru and Dima (thanks for your advice)... I have tried your instruction to repair my error pen drive carefully and the final result is fail :(.

Smart, January 2014

Thanks a lot TeckGuru
I recovered 6 pendrives with your tip

Marcelo, July 2013

Thank you very much i too got my pendrive fixed with disk management. Actually I was trying to make my pendrive bootalbe with iso-to-usb tool. Unfortunately I ended up with the problem of unknown capacity. But now its working. Thanks again :)

Ravi Dhruv, December 2012

Thanks a lot..!!
It worked awesome..

Lohith, December 2012

Greetings! I'm was thinking to drawn my external drives, thanks

Naziirull, September 2012

arthas.. has the answer!!
arthas.. has the answer!!
arthas.. has the answer!!
arthas.. has the answer!!
arthas.. hasthe answer!!

thanx again ;-)))))

ANDY_BEE, September 2010

hey well done arthas.. great work dude!! all back to normal

andy_bee, September 2010

my pendrive is not showing in the list !! after doing LIST DISK ls help!!

priyesh, August 2010

thanks Thanks Thanks
Thanks
Thanks
Thanks
Thanks
Thanks
Thanks Thanks
Thanks Thanks

GB2KB, August 2010

i followed the steps.
on selecting my pen drive,which was in disk 1.
It got selected but on clean command "CLEAN"
it shows data error:cyclic redundancy.
unable to complete command.

arthas, July 2010

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

this tool helped me out with same problem.

http://files.extremeoverclocking.com/file.php?f=197

dima, March 2010

give me solution
was installing win xp again on my computer.SO firstly I did the partitioning of space in the hard drive.But I forgot to detach my pen drive..and during partitioning we initially make unpartion space.My pendrive was also attached with the computer and so i also made the 1gb partition as unpartioned. The unpartitioned space of pendrive can be viewed separately..

Now after I installed win xp successfully..and after that i attached my pen drive with it again..then it shows in f: and when i click on it...th emessage comes : - "Please insert disc in drive F: ..and when i try to format my pen drive..then it is showing pen drive with unknown capacity...and it's unable to format it also...

Kindly help me to recover it...I would be very grateful to u..

krishnendu, May 2009

Thank you very much guys for helping me...I found the soln.
my pen drv was not partitioned.So I parttioned grom disk management...which gives my pen drv name and so it formatted my raw pen dev space to 1 gb...

barjinder, February 2008

go to any of your friend's computer and try to format the pen drive in windows and if it fails then try to format this in DOS mode, perhaps this will solve your problem.

Vickyxzxz7357, February 2008

if you are using a SANDISK....I found a utility from them "usb drive test tool" and downloaded that and it should rewrite it. if you want to recover info on your drive for free search for "PC inspector"

Higgster, February 2008