If you have OS X 10.6, this will impress your friends and save you
some disk space:
% du -h -d 1 mydata
3.5G mydata
mv mydata mydata.1
sudo ditto --hfsCompression mydata.1 mydata
rm -rf mydata.1
% du -h -d 1 mydata
1.8G mydata
This does hfs filesystem compression, so the images are still
recognized by mosflm, et al. I think they process a bit faster too,
because half the information is packed into the resource fork.
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