Well, after much research, it appears that the information on the Samsung eMMC part that is used in the Nokia N9 / N950 is proprietary and not available. I don't what what the structure of the FTL ( Flash Translation Layer ) is for the eMMC and so I wouldn't know what the LBA to flash erase block mappings would be. This is a problem because something like this works at the flash erase block level and bypasses the flash controller. I'm just glad that my MyDocs filesystem survived with apparently no problems. I don't have much hope though for recovering the rootfs, unless I can get proprietary Samsung eMMC documents.

jdb2