My USB is not working well

a month ago i bought a USB drive Sandisk Slicer 4Gb it worked great so a week ago i needed to use my USB to install windows 7 there and make it bootable though the USB i did it it worked well also. so now i dont need windows on my USB and i have formted it using right click and format on windows 7 and now he says i have 212 mb and not 4gb

how do i fix this?!?
2 answers Last reply
More about working well
  1. goto START, try right click (My) "Computer" > Manage > Disk Management

    find yr flash drive and delete all partitions then reformat
  2. where is delete or partitions button i cant find
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