hp recovery usb give error Unmountable Boot Volume

[stings1988]

i am using factory installed win7 over hp laptop its working perfectly even recovery from f11 and hp recovery manager system recovery option also working means easily to restore .
i was create recovery usb from recovery manager when i try to boot usb for recovery after loading start error show Unmountable Boot Volume blue screen appears
anyway out

 

[theog]

You may have bad USB Pendrive.