I can't write the image to my USB..Done everything correct, after the WRITE is completed I click on F drive ( my USB drive ) and it says :

Disk F is not formatted, do you want to format it now..

I clicked Yes, selected FAT32 and clicked START and it says format complete..

After that I again open WIN32DiscImager, select the pimp.img file and click write to F and after I am done I again go to F drive ( my usd drive ) to see if the files are there and after I click on F drive it again says Disk F is not formatted, do you want to format it now..

What could be the issue here, done writing files to USB million times so far with no issues what so ever, what could be the problem, my USB run BAMT 1.6.2. before, it has 4GB..?