Disk image space not regained after deleting...

Using my Powerbook I created backups and a 300gb disk image as a pseudo partition on a 1TB Time Capsule. This was prior to owning my MBP. I then used the same Time Capsule to make backups for my new MBP. I went back to my Powerbook to try to regain that 300gb's by deleting the disk image. I stuck it in the trash and deleted... But no space was regained and now the disk image is obviously gone. I'm afraid, as I think more carefully about it, that I needed to erase the disk image, once mounted, in Disk Utility (which is where the disk image was created in the first place). I'm also afraid that I'm now going to have to reformat the entire drive, erasing all back ups from both the PB and MBP, to regain the space? If anyone knows anything about this or has any advice it would be greatly appreciated.
Thanks for your time!
Andrew

Thank you, Bob.
Ok, here's where I'm at...
I ran a Drive Genius 2 scan on the TC with my MBP and cancelled it after about 5 percent was completed. It was going to take all day and I didn't think it was going to do anything. To my surprise when I went back to my desktop and got info on the TC it showed over 500gb available, whereas before it showed 116gb available... so somehow I regained more than just my 300gb disk image worth of space back. Weird. (Although, I now understand how those figures can sometimes be misleading.) This rough figure would tell me that the MBP is also recognizing the Powerbook back ups as well even though they are not visible in Finder.
Next, I connected with my PB and Finder showed only 116gb available... which wasn't too surprising. I then ran the same procedure with Drive Genius, this time only to about .65 percent complete and when I went to get info it showed that I had 805gb available. HA! So I guess it is not recognizing the MBP backups but that's no big deal. I won't be making anymore back ups with the PB anyway.
Well, thanks for your help, Bob. I always learn something when I come to Discussions!
Andrew

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