My external drive stopped working for unknown reasons,

It reads in RAW format, I tried to reformat, but it says "unable to complete format" ive downloaded programs to force reformat it without success, tried to repartition it. Help? advice? something ill try anything to save my hard drive portable 500 GB wd, ive downloaded test disk and accidentally changed the cylinders and don't remember what the correct setting has been, I assumed because the fix has not worked would not save my error.

Hello

1. have you tried to connect the hard drive on another computer?
2. other USB devices work well?
3. the USB external hard drive works in Mode safe?
4. can you see the external hard drive USB in Device Manager?

You may have performed the steps in the following article.
Check a drive for errors
Important: when running chkdsk on the drive hard if bad sectors are found on the disk hard when chkdsk attempts to repair this area if all available on which data may be lost.
 
It will be useful.

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