when i booted into windows and then back to linux there was always additional checksum error in superblock. when i was booting only to linux then there were always errors i wrote in previous comments, but I don't remember exact numbers
all this started because of damaged disk (hw problems), I had to buy new one and transfer what I could. i was using ext2fsd for years, but on partitions created years ago. it seems it doesn't like ones created with ubuntu 16.10. I already reported this problem to ext2fsd project
When I identified that issue was related with ext2fsd I removed it from windows, reformatted ext4 partitions and restored data from this damaged disk again - now everything seems to work without any problem. That also means I am not currently able to reproduce problem - I don't want to damage data, restoring takes very long time
dumpef2s output attached
when i booted into windows and then back to linux there was always additional checksum error in superblock. when i was booting only to linux then there were always errors i wrote in previous comments, but I don't remember exact numbers
all this started because of damaged disk (hw problems), I had to buy new one and transfer what I could. i was using ext2fsd for years, but on partitions created years ago. it seems it doesn't like ones created with ubuntu 16.10. I already reported this problem to ext2fsd project
When I identified that issue was related with ext2fsd I removed it from windows, reformatted ext4 partitions and restored data from this damaged disk again - now everything seems to work without any problem. That also means I am not currently able to reproduce problem - I don't want to damage data, restoring takes very long time