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https://www.cgsecurity.org/wiki/TestDisk_Download

I found it but can't figure how to install and use it.

My Raid 5 (4x3TB) was running degraded and before I was able to replace the failed HD, an Ubuntu kernel upgrade fried the raid. Not being able to rebuild the arrray, I zeroed the superblock and recreated. Probably my first mistake. I was able to get the array to resync and become clean but still am ...

Testdisk, dev/md0, None, Advanced, Type, ext4, Superblock gives me...

TestDisk 6.14, Data Recovery Utility, July 2013
Christophe GRENIER <grenier@cgsecurity.org>
http://www.cgsecurity.org

Disk /dev/md0 - 9001 GB / 8383 GiB - CHS 2197600128 2 4

Partition Start End Size in sectors

>[ Quit ]

or ...

I've a Raid 5 that I can't mount do to missing ext4

john@nasmedia:~$ sudo mount -a
mount: wrong fs type, bad option, bad superblock on /dev/md0,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so

john@nasmedia:~$ dmesg ...