Windows was unable to complete the format

check that the pen drive isnt locked to stop you formatting it
otherwise google a 3rd party formatting software

sometimes windows has trouble formatting pen drives

insert it again and try to format it quick ..and change the allocation unit size...and also make sure that it is Fat 32 not NTFS ..

connect it to PC then... go to My Computer icon on desk top >> right click >> manage >> Disk management >> select ur USB Flash Drive/pen drive >> right click >>format ....ok......

most likely the device ( pen drive ) is unable to use 4 gb of memory and thats why you have errors.

it could also be that you need to format the card correctly before use

Please buy pen drive below 8gb because after you may face problems (file system problem,formatting ,etc.)
So my dear friend don't loose your money to buy more capacity pen drives they are all fake.
Hope this will help you my advice.

If i am helpful please rate me.
Thank you.

Yboyandrei

Far too often these little things have an almost invisible read/write protect button on them. Look carefully, over the entire surface of the USB Flash Drive. You might have this switch turned to Write Protect, which means there is nothing you can do, until you turn it the other way, and allow the device to be written to.

Cheers!
-a.

try formating the card using a digital device such as a camera or a playstation portable (PSP)

I formats the pen drive but due to the electricity cut off, format doesn't complete and pen drive doesn't recognize in computer

Try HP formatting tool with administrator previliages in vista

I know about this problem and the solution.

First, you should know your pen drive is infected with a virus. You can't usually repair it, you'lll just have to format it, and I'm getting to that.

Now, Before you format the pen drive, you might want to preserve some files in the drive?

Instead of trying to view the pen drive by double clicking or right click=>open TYPE the ASSOCIATED DRIVE LETTER at the RUN DIALOG BOX (start=>run)

Eg:
If your pen drive is assigned to drive E:
Start=>Run
Type "E:" (without quotes) and hit enter.
It should open.

Now you will probably see some weired .exe file, probably named fun.exe. That's the virus. You just cant delete it. BUT you can copy the rest of the imprtant files to your hard drive.

TO FORMAT
Start=>Run
type "cmd" (without qoutes) and hit enter
type "format/x E:" (without qoutes and mind your spellings and spacing. REPLACE "E:" with the associated drive letter of the pen drive)
Hit enter.

Hope my info fixes your problem,
Thanx for using fixya.