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Backup only "filled" (=used) sectors?

Posted: Sat Jun 20, 2015 10:10 am
by pstein
I have a 32GB USB flash drive.

This device is used by only 15% (as indicated e.g. by partition management tools).

However when I use USB image tool to create a backup then the resulting image is (uncompressed) 32 GB and compressed approx 21 GB.

How comes?

Is there a mode which backups really really only occupied sectors and omit free sectors?

Peter

Re: Backup only "filled" (=used) sectors?

Posted: Sun Jun 21, 2015 8:21 am
by Alex
Device mode backups every byte of the device, regardless the partition data.