ReadyNAS 31600 Booting problem; system hangs when booting reaches 99%

As the nae says, the RN31600 is a ReadyNAS device. You might get more help, and find earlier questions and answers specific to your device, in the appropriate section for your hardware. That's probably here:

ReadyNAS Network Storage: Official NETGEAR Community

There is not much on common between ReadyNAS and the router covered here.

I will ask the Netgear moderator to move your message.

In the meantime you could visit the support pages:

Support | NETGEAR

Feed in your model number and check the documentation for your hardware. Look at the label on the device for the model number.

You may have done this already. I can't tell from your message.

I mention it because Netgear stopped supplying printed manuals and CD versions some years ago and people sometimes miss the downloads.