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A while ago I had some hardware issues with my desktop and used a USB stick to put a bootable memtest on it to do some diagnosis (at the time it was that one of the memory sticks was bad). Fast forward several weeks later however and now I'd like to find a way to get rid of memtest on my USB so that I may use it again for storing small documents and things of that nature.

Would anyone know how to restore a USB stick to its original state?

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Waht happeens when you attempt to format the USB stick? What is the host OS you will connect USB device to? – Dave M Feb 6 '13 at 22:18

Just format the drive, which will make it unbootable and empty.

enter image description here

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This does not help, because memtes changes partitions on the drive. – kvetis Dec 31 '15 at 19:05
  1. Insert USB Disk.
  2. Launch the imageUSB program that you used to create the MemTest86 USB and select the appropriate USB Disk. (Be careful and select the correct drive!).
  3. Choose the Zero USB Disk option & Run.
  4. Drive MBR (Master Boot Record) is now Zeroed. You will need to reinsert the drive for Windows to recognize it and prompt for formatting before you can use it again. A normal format will now recover the full capacity of the USB drive.
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Is there any reason why this is preferable to the other posted answers? – G-Man May 2 '15 at 4:00
    
Yes, it is the only solution that seems to work. The MBR table is changed on the drive using imageUSB, Windows itself cannot reset it to the previous state. – kvetis Dec 31 '15 at 19:08
    
@G-Man because the MBR of the flash drive has been changed by memtest and needs resetting. Formatting the device will erase the data but will not reset MBR. So the available space on the empty device will be less then its capacity. Resetting the MBR using this method not only removes all data but also reclaims all space on the USB device passmark.com/forum/… – Ejaz May 25 at 10:28

No need to format your device!
If you can't remove or change anything, then probably your USB Stick is in "Read-Only" state.
Otherwise, smtg is wrong with your driver or there is a stupid virus.

But if all is OK, just make your Windows show all System and Hidden files,
or start CMD.exe and write there:

attrib -s -h -r <your drive>\*.* /s /d

Now all files are visible and are not Read-Only, including memtest. Now you can remove all odd files!

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