Difficulty deleting backups

I deleted some backups by entering the Time Machine interface, going to the relevant backup times, clicking on the gear and then clicking on delete backups. All the backups I deleted no longer appear in the Time Machine interface. All but one have been deleted from inside Backups.backupdb. The one that remains is large because I archived and installed Leopard prior to that backup. It certainly doesn't seem to have been deleted because the space it takes up has not been recovered after compacting the sparsebundle.
How do I delete this backup given that it no longer appears in the Time Machine interface?
Thanks.

Sananda M wrote:
Hi
No, I mean that of the four backups I attempted to delete only one remains. They are many many other backups.
I know that the backup that hasn't completely deleted was 3.3GB and therefore I expect to regain something along those lines when it is properly deleted.
Maybe. It's very hard to predict just how much space you'll gain by deleting a TM backup. Suppose you add a 10 gb file and do a backup that's 10 gb. Then you add a 1 gb file and do another backup, of 1 gb. If you delete the first backup, you won't get any space back, because the 10 gb file was still on your system when the second backup was done.
Deleting a TM backup deletes the backup folder and all the "hard links" in that folder. But the backup copies of files and folders aren't deleted until the last hard link to them is deleted. That's how TM can perform only incremental backups of new and changed items, but have every backup be, in effect, a *full backup* of your entire system!
I repaired the sparsebundle as you kindly suggested and it reported as ok but the undeleted backup remains. I've now found reference in Console to the undeleted backup in questions: "Found partially deleted backup - trying again to delete", which I probably interrupted, I guess it will attempt to do this.
That may explain part of it. Click here to download the +Time Machine Buddy+ widget. It shows the messages from your logs for one TM backup run at a time, in a small window. You'll no doubt see TM trying to delete it at least once, and it will probably keep trying until it succeeds. The Repair you did of the sparsebundle may help it.

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    Message was edited by: Pondini

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