Hi, there is a workaround.
Assumes the following:-
1. Toshiba External HDD is Mac specific (HFS+ file system)
2. Password has been enabled.
http://support.toshiba.com/sscontent?contentId=4008402
Issue
Due to an unforeseen capability issue with Apple’s OS X El Capitan, the Password Software is not compatible and cannot access your Password. Toshiba engineering is working on this issue with Apple. The current workaround is to disable your password software with an older OS X version or gain access via a Window’s PC.
We apologize for the inconvenience, and ask that you check back until the issue is resolved.
Resolution
If you are using Mac OS X "El Capitan", follow the steps below to disable the HDD password.
NOTE: You will need the following items:
- Windows PC
- HDD Password Tool for Windows
Procedure
- Download the HDD Password Tool for Windows found under the Drivers and Updates tab or use this link to access it.
- Install the HDD Password Tool for Windows on a Windows PC
- After completing the HDD Password Tool install, connect external HDD ( in Mac HFS+ format ) to the Windows PC.
- Launch the HDD Password Tool. If the HDD Password Tool launches automatically, quit the application and launch it manually.
- The HDD Password Tool will require you to enter the HDD password. Enter the password.
- After entering the HDD password, the HDD will be unlocked.
- You will be required to enter the password again to remove the password. The "Remove passwor protection" option should be selected. Entering your password will remove the password protection.
- A dialog box will be displayed asking if you want to remove the password. Click "Yes"
- A dialog box will be displayed confirming the password has been removed.
- Close the HDD Password Tool.
- Now that the password is disabled, you can use the HDD on the Mac OS X.