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painted into a corner

Greetings all;

I just installed stretch to a fresh 2T HD. letting it autopartition and 
format for separate /, swap, /var and /home partitions. But I didn't let 
it overwrite the grub on the 1st drive it was/is  booting wheezy from.

I figured I'd mount it to wheezy and copy over my personal stuff, like an 
email corpus well over 15GB reaching back to 2002.

But I can't mount much of the drive, / is all that will actually mount, 
because the 2 versions of ext4 are incompatible, nearly all the mount 
and e2tools can't touch the installers ext4 file systems.

For instance, its not mounted:
gene@coyote:~$ e2fsck /dev/sdb8
e2fsck 1.42.5 (29-Jul-2012)
/dev/sdb8 has unsupported feature(s): metadata_csum
e2fsck: Get a newer version of e2fsck!

And of course whats installed to wheezy is the latest available wheezy 
version of e2fsck.

Whats the recommended way to do these mounts so I can maintain as much 
continuity as possible?

Thanks all.

Cheers, Gene Heskett
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>

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