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Restore Disk Size


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Why is it that when I try to restore an entire disk from a snapshot, the restore is bigger that what was on the disk? I have a 30G (23G) FireWire drive that I had to reformat. When I go to restore the disk, Retrospect wants to put back 37G. Is this extra duplicate files? How can I get just the files that were on the drive at the time of the last backup?

 

Thanks

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  • 2 weeks later...

This has to do with Block Allocation size.

 

 

 

The reason is that Retrospect (for display purposes only) assumes that the HD was initialized in Mac OS Standard format. This means that each file is displayed using a 512k block allocation size when the disk is actually using only 7k (MacOS Extended volume) block size. This causes all of the file sizes to appear inflated. Because the user really does have enough free disk space, it will be safe to ignore the "overflow the destination" warning and complete the restore process. Retrospect will write data until the hard disk reports it has no space remaining.

 

 

 

More details and screenshot examples on Allocation Block Size can be found at:

 

 

 

http://www.dantz.com/index.php3?SCREEN=tn412

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