"broken" USB stick

I recently used Diskpart to setup a bootable USB stick. However when I used ASSIGN, I didn't include a drive letter, and Diskpart ended up hanging. I killed the process, but Windows 7 refuses to assign a drive letter to the device. Under Device Manager\Portable Devices, it shows the WPD FileSystem Volume Driver with a warning icon on top of it, and looking under Properties would show that the device could not be started. I used GParted in Linux to reformat my drive once as NTFS, and the second time as FAT32, and it still wouldn't be detected.

I've performed this procedure twice in the past before I saw people using ASSIGN with a drive letter. The first time my USB stick was detected by Windows after a few attempts of unmounting/remounting the drive, and disabling/enabling the driver. No such luck this time.

Anyone know how I can fix this?
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dbruntonQuid, Me Anxius Sum?  Illegitimi non carborundum.Commented:

Retry formatting using Rufus https://rufus.akeo.ie/

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Dr. KlahnPrincipal Software EngineerCommented:
Block erase it with Active@ Killdisk and start over, possibly?
Seth SimmonsSr. Systems AdministratorCommented:
i would try it on another system and see if you can assign a drive letter; help rule out if it's the usb drive or windows
if you can, could be a driver issue on this system
do other usb drives work on this system?
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what happens if you redo diskpart ?  http://www.wikihow.com/Make-a-USB-Bootable
noxchoGlobal Support CoordinatorCommented:
I this your usb stick is bad. If it does not let you assign a drive letter or format it on different pc then destroy it and buy new one.
could be a counterfeit one also..
TitlevestAuthor Commented:
dbrunton's advice worked. Despite Windows 7 not being able to mount/detect it at all, Rufus detected it, was able to format it, and make it detectable again.

This is the first time a Linux tool didn't work for me.

Rufus is a great tool. Spread the word.
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