I can't see this solving it, but here goes anyway:
- Select the drive's icon
- Press APPLE+I to 'Get Info'
- At the bottom of the window that appears, under 'Ownership & Permission', click on the arrow next to 'Details'
- Click on the little padlock next to the grayed out drop-down menu alongside 'Owner' to unlock it
- Give the user account you're logged in to specific ownership of the drive using the now active drop-down menu
- Now try verifying/repairing the drive again using 'Disk Utility'
It probably won't work, but it's worth a shot.
Good luck,
onlyone-jc.