Mac OS X - Ignore Ownership on this volume
You are unable to access a non-boot volume connected to your Mac? You can specifiy Mac OSX to ignore ownership of files for this volume.
- Select the drive/volume.
- Click on File > Get Info.
- Expand the Sharing and Permissions section
- Click on the padlock icon and enter your admin password.
- Check the following option "Ignore Ownership on this volume".