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Good Morning Ed,

Interesting subject. I'm not sure what else there is out there to use to shrink. Of course it depends on the amount of data that is really on the SD card. I had a 32 gig card and it shrunk down to about 2.5 gigs, which is probably the amount of actual data on the card. Then I zipped it. That took it down to less than 1 gig. I shrunk about everything I have for images (quite a few for backups). With shrinking them first and then zipping, each one was less than 1 gig.

Mick - W7CAT