How to downgrade RAID1 to JBOD

[yuppy_xxi]

I had one HDD in JBOD mode and wanted to extend file space. When I installed a second HDD the system without asking of my confirmation switched to RAID1 and started syncing.

How can I switch back to JBOD?

If ReadyNAS OS isn't able to do it without factory reset, is it safe to do factory reset on legacy hardware upgraded to OS6?

[StephenB · Accepted solution]

If you are comfortable with ssh, there is a thread here that gives you information you need to undo the RAID-1: https://community.netgear.com/t5/Using-your-ReadyNAS-in-Business/Reducing-RAID-size-removing-drives-...

You can also do a factory reset (either via the boot menu, or from the system->settings->update page).  Remove the new disk before you do that.  Then convert to flexraid before you hot-insert the new disk. 

I suggest unformatting (or zeroing) the new disk in a Windows PC before you hot-insert it. 

[StephenB · Accepted solution]

If you are comfortable with ssh, there is a thread here that gives you information you need to undo the RAID-1: https://community.netgear.com/t5/Using-your-ReadyNAS-in-Business/Reducing-RAID-size-removing-drives-...

You can also do a factory reset (either via the boot menu, or from the system->settings->update page).  Remove the new disk before you do that.  Then convert to flexraid before you hot-insert the new disk. 

I suggest unformatting (or zeroing) the new disk in a Windows PC before you hot-insert it. 

[yuppy_xxi]

mdadm solution worked. Thank you.