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Anyone used sparse fs on a linux system?

Community Veteran
Posts: 6,607
Thanks: 209
Fixes: 15
Registered: 16-02-2009

Anyone used sparse fs on a linux system?

I am doing some Android hacking and have a system.img that is an ext4 in a sparse image  Undecided
Not sure if I need to recreate a sparse image to upload it at the moment (not got the tablet), so have been looking at sparse FS's and boy are they weird.
I can unpack it using simg2img but get a crc error out of it.
simg2img system.img test.img
computed crc32 of 0xe1b13ed7, expected 0x00000000

The result is a mountable ext4 image, but I am worried about the crc error.
Update found a new copy of the ext4 utils that compiles and gives no error now.