If You Forgot Your Password the Only Way to use it once more is Erasing the Entire HDD ( ALL DATA WILL BE ERASED )
If After Attempting 5 Times with an Invalid Password it Does not Shows you the ''ERASE'' Option
You will Need to Download the '' FIRMWARE UPDATE '' for Your HD and Then You Will Be able to Try With an Invalid
Password 5 Times and it Will Give you the Option to erase it
If you need Further information , Don't Hesitate Just let me Know.....