ReadyNAS Upgrade from Ultra 4 to 214

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EnochPowell wrote:

I then installed the 2 drives from my old ultra 4 and put them into the 214

 

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If your Ultra was running 4.2.x firmware, then that was a big mistake.  You can temporarily mount OS 4.2.x drives in an x86 OS-6 NAS, but you cannot do that with arm platforms like the RN214.  

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EnochPowell wrote:

The problem is, I have put the disks back in the ultra 4 and it just says "Booting" all the time. Really worried about my data now.

It is at risk.  If you are lucky, only the OS partition on the disks were damaged.

You could try powering down the Ultra, and see if it boots without disk 1 installed (keep disk 2 in slot 2).

If you are using OS 4.2.x in the ultra, you can use paid Netgear support (my.netgear.com), though they might need to charge for data recovery.  https://kb.netgear.com/69/ReadyNAS-Data-Recovery-Diagnostics-Scope-of-Service

You could also try connecting one disk to a Windows PC (either SATA or via a USB adapter/dock), and see if R-linux for Windows can see the data.  You'd need to off-load it.  https://www.r-studio.com/free-linux-recovery/ Note that if you are running OS-6 on the Ultra you'd need to use recovery software that supports btrfs. There are no free packages, you'd need to something like ReclaiMe (https://www.reclaime.com/ ).  You can see what it can recover before you purchase it.