Question: so where is the remaining 72 GB (307-235).
(a) Are you sure you are using Mac OS X 10.6.7? (There is a different answer if you're using Lion.)
(b) From OmniDiskSweeper's Help: "OmniDiskSweeper only displays files that you have access to from the user account you are logged into. Files in restricted folders are not available and their sizes are not included in the total file sizes you see".
Can I delete this 'iPod Photo Cache'?
Yes (but it will be re-created). See
I have another 12.2 GB of Recovered messages as a mailbox? What could this be related to?
See this thread
Its amazing how this HD is getting gobbled up
IMHO, 320GB isn't much, these days. Mine is 750GB and I'm already having to move stuff to an external drive.
Thanks Fane. In response
1) Mac OSX version - Yes, it is 10.6.8 version. Please let me have your suggestions about finding the missing 72GB
2) Deleting Ipod Photo cache - Do you have idea how long it takes to build up to 33 GB. How often should I be deleting this cache. I have had the laptop for 2.5 years now and it is the first time I need to do this
3) Recovered messages - Thanks, I review the link
Is there any other way apart from Omni Disc Sweeper to figure out the missing 72 GB
Even as admin, you don't have access to all files on the boot disk. My expectation is that this is the cause of the discrepancy (although 72GB is far too much). ODS runs with your permissions, so it can only access files you are allowed to access. WhatSize can run as root, but it's not free. You can run ODS as root from Terminal by following this tip
If this doesn't help, then the only solution will be more Terminal.