Forgot Password -passport external portable HD 1TB reformatting not possible - it is unlocked

I have forgotten my password for the 1 TB muy passport external portable HD. I am ready to reformat it so that I can pass it on to my family member. 

It appears that I cannot reformat it to  make it usable for mac computer.

my questiins:

how can i recover password?

how can I re format the drive…mac cannot recognize the devise becuase it is unlocked.

thnaks guys for any help

Try logging on about 5 or 6 times and it should give an option to erase.

Joe

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