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Forum Discussion
scowenhoven
May 26, 2026Aspirant
Xpenology - ReadyNAS 628X
Hello! Since the ReadyNAS is no longer supported, has anyone installed Xpenology on a 628x? If so, are there any documented instructions or videos that you followed? I currently also have a Syn...
Sandshark
Jun 27, 2026Sensei
I don't know why the console serial connection can't be used to install Xpenology as it is with other alternate OSes. But while I've seen this question elsewhere, I've not seen anyone post that they did it successfully. I understand the ARC loader can also install Xpenology completely headless via USB boot and a network connection, so that should work on a 628x. While the 628x has a PCIE slot, finding a video card that will fit in the available space would be difficult, if not impossible (I've not tried). But if it's only temporary to install an OS, you could use an extension cable and install it externally.
To get the 628x to boot from a device other than the internal flash requires that you physically remove the flash DOM and use the console connection (or video card connection if you figure out how to get one installed) to modify the BIOS settings. If you change the boot device away from the internal flash and don't remove it, the BIOS will revert to internal flash. A bigger DOM could also be used for an alternate OS boot device, but it's only USB2.
Many installing an alternate OS on the 600 series utilize an M.2 drive (SATA only) for the OS in the internal M.2 slot.
scowenhoven
Jul 29, 2026Aspirant
Thanks for the info! So it sounds like the ReadyNAS OS is installed on the M.2 drive. So I can replace it and install another OS as long as I can get into the BIOS, change the boot order, and remove internal flash. I take it I can replace the M.2 drive to revert back to the ReadyNAS OS.
- SandsharkJul 30, 2026Sensei
By default, there is no M.2 drive -- just an empty slot. But that is where many who have a unit with the M.2 slot (52x and 62x units) do install an alternate OS. OS6 is installed on the drives, but is booted via a reduced OS run from a USB DOM. To boot from anything other than the DOM without interaction, the DOM must be removed. Re-installing the DOM does revert to OS6 so long as you've kept its contents intact, as OS install is also performed from it.
- tigertenJul 30, 2026Luminary
I think he confuses the USB DOM with the M.2 drive.
There is one USB DOM, which is the ReadyNAS boot drive.
There is a M.2 SATA slot, which is empty. It is just a regular hard drive can be used to install alternate OSes, like windows server, TruNAS,
Xpenology boots off the USB DOM is preferred.
Clarify one misinfo, you do not have to remove the USB DOM in order to boot from the M.2. All you need is to set BIOS/advanced/Storage from the EFI to legacy. then you can choose the M.2 as the boot device.
- SandsharkAug 01, 2026Sensei
And that survives a power cycle? Everything I've read says otherwise, so I never actually tried anything else.
- StephenBJul 30, 2026Guru - Experienced User
scowenhoven wrote:
So it sounds like the ReadyNAS OS is installed on the M.2 drive.
No. To add to what Sandshark said:
There is a small (4GB) RAID-1 group that spans all the hard drives. That holds the ReadyNAS OS. There is also a small second small RAID group for swap, that also spans all hard drives.
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