How to delete backup files from old backup drive?

Hi,
I recently changed the backup drive used by Time Machine, from /Volumes/vast4 to /Volumes/vast2 (for example). Time machine now happily backs up to vast2 and shows available backups going back to the date of the change from one drive to the other. I no longer need the old backups on /Volumes/vast4, and I do need the 2GB of space they occupy. These old backups are not visible in Time Machine - it sees only backups on the new backup volume. Completely manual deletion of /Volumes/vast4/Backups.backupdb, with rm -r in a terminal, gives "Permission denied" even when I have admin privleges. Is there a way to do this deletion from within Time Machine, or at the command line? Any help is appreciated.
Thanks,
Jason

First try to use Disk Utility to repair that disk permissions. Then you can also get info on that folder and take a look at what sharing and permissions are set there. If you don't see your name there (your user name, not the admin) then add it by clicking on the plus sign. Set the permissions to Read & Write. Now try to delete the folder.

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