[GiH]

So if your disk was created in IRIX 6.2 or an earlier 6.5 version, chances are Linux won't read it.

Exactly. I have 6.2

run a very old (like Knoppix?) Live CD from like 2003-2005

This a KNOPPIX 3.x. It was a challenge to find it. I found a fork of it https://archiveos.org/knoppix-mib/ It won't boot on my PC.

It's like a chinese snake eating itself.

I think the best way to put another hard drive in Indygo 2 and install IRIX 6.5 on it then plug the old one as a second drive and mount it.

I will let you know how it goes.