Data recovery : most important areas of Ext4 filesystem

[minesheep]

In my case it was not filesystem damage because

Code:

sudo dd if=/dev/sdx of=/dev/null

failed also. When i overwrote the data I got the drive working again. Same had also happened to my hdd that was unused few years I also fixed the hdd by overwrting it.It is called  data rot. Now I have working flash drive and almost all of my data. Since it was only raw music 90% data means 90% recovered audio.