My computer cannot recognize my Toshiba 1TB external hard drive

Today i faced a new issue.
issue was
"My computer cannot recognize my Toshiba 1TB external hard drive"
i tried on both Windows 7 and 8.1, but no luck.
while connecting the drive system was detecting to it. a pop up appeared that a new device installed successfully.
also shown in device manager.
but not showing in my computer. i was unable to access.

solution was.
actually the drive was password protected by Toshiba password tool.
after downloading/installing this tool from Toshiba official website.
the system restart and after restart and login to the system the Toshiba password tool asking for password.
then after entering the password.
It was accessible.