USB is no longer recognised by Macbook Pro

I was trying to follow the instructions from this website: http://www.macworld.com/article/2056561/how-to-make-a-bootable-mavericks-install -drive.html
to help my friend reboot her laptop. Prior to this my USB has never had a problem, and I was preparing for it to be a boot disk, via the Option 2 instructions from that link.
Now I'm getting a disk error (see below) and the USB is unrecognised in DU and cannot be partioned or erased:
"Disk Erase failed with the error: POSIX reports: The operation couldn’t be completed. Input/output error"
Would really appreciate the help, thanks!

Oh dear. No replies seems to imply this is a thing that can't be fixed at all.

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