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Originally Posted by
Glenn NK
I just went through all of my files (Canon 30D and 5DII); typical RAW file sizes are in the order of 8,000 KB and 23,000 KB respectively.
Every last one of the XMP files are either 5 KB or 7 KB (respectively), and some of them contain extensive editing data (Adjustment Brush).
The XMP are very small in comparison to the RAW files, and for practical purposes negligible. A quick bit of math reveals that for the 23,000 odd RAW files I have, the total of the XMP files is about equal to five RAW files from the 5DII.
Lightroom is very efficient in this respect.
Glenn