Data recovery : most important areas of Ext4 filesystem

[minesheep]

Tried cloning one 10gb file at 512mb at time

Code:

dd if=myimportantfile.raw of=/media/veracrypt1/part(x) bs=512M count=1 skip=x-1

where x is the part number when copying. when bs*count (512M*1) is the amount of data at one time. Got 17 full parts and 18 is only partitial. When using

Code:

dd if=myimportantfile.raw of=/media/veracrypt1/part19 bs=512M count=1 skip=18

that means reading file mibibytes 9216-9728 (yes they should exist), I get "dd: error reading 'myfile.raw': Input/output error". I get the same error also reding part20 = mibibytes 9728-10241 of the file. As said earlier this is still 90% recovery and is enough. So 9gb of 10gb recovered from the most important file