Re: [GTALUG] Compressing an image of a microSD card

| From: Lennart Sorensen via talk <talk@gtalug.org> | Certainly something like clonezilla knows how to deal with filesystems | and partitions and ignore the parts of the filesystem that are not in use | (even if not zeroed). If you use fstrim on a filesystem, what happens when a dd accesses an unallocated block? Is that well-defined? An I/O error? Are all unallocated blocks identical? Is this up to the manufacturer or some standard? (I'm too lazy or too busy to experiment.)