I'm in the process of recovering files from an accidentally formated Ext4 partition using Photorec. It had about 300Gb of data, of which I've already got hold of about 30Gb.
So far, it seems to me that the recovery of RAR-compressed files has been much more successful than the recovery of individual uncompressed files and ZIP compressed files – in the sense that a lot of recovered files/zips were unreadable, and pretty much all of the RAR files were intact.
Is there such a relation? Are RAR-compressed files really less prone to corruption and thus easier to recover?