Windows 7 - Flash Drive Memory Decreased

I used my flash drive to boot up something
Then i just formatted it via right click>format

Then, the only selection was 250mb.. so i did it
It was 2GB.

What should I do?

Reformat the USB drive and set it to 2GB partition.

In the capacity, the only selection is 250 mb.

1) Format the flash drive via Disk management in windows. Click on start button, then type "diskmgmt.msc" without the quotes and hit enter. In the window that opens up, right click on your drive and format.

2) Where did you get this drive from? Apparently, there are a lot of fake drives on the market that report oversized capacity. You can use the Burnin test to determine your drive's real capacity.

BurnInTest - Detecting fake and oversize USB drive capacity

Thank you for your reply ,
I do see my lost 1.64 Gb,
but I am not able to extend, nor delete the 250mb partition..

It's 'Transcend' , and bought it from a bookstore(National book store), So i guess its trustworthy.

Try doing it through the HP USB disk format tool. Download here.

Thank you very much
Solved it !