usb not showing space and not opening

#1
hi....
my usb drive is not showing any space or data.

last time , i made it bootable of Windows 7.

and then i copied the Windows 7 all files into usb drive.

then i deleted that file and choose the eject option to making it off.

i ejected it for 5 to 6 times.

after that my usb not working.

when i try to open it then these messages come.

i take pictues of it. soo see them
 


#2
remaining pictures are:












 


#3
i have found the solution of this.
i found a utility program which force it to format and lastly my usb has been formatted noww
 


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