OmniDiskSweeper: differences in reported disk space?

[Ashley Aitken]

On 19/04/2007, at 1:20 AM, Matt Johnston wrote:

> New 750 GB drive installed in an iMac intel. Shows up as a 698GB  
> volume. No problem. Copied data across to it and suddenly 388 GB of  
> data has ballooned to 635 GB. It reports this in Finder and in  
> Terminal using df -h.

How did you do the copy?

Finder?  Disk Utility Folder Copy?  Disk Utility Volume Copy?

Cheers,
Ashley.