Can a drive larger than 4TB (5TB, 6TB, or 8TB) be added to the DS5100 if you edit the drivelist file?

With the latest firmware (2.2.10.18) the DriveList still exists, but it is not enforced (AFAICT). I just installed an unsupported SSD as my boot drive, and it boots and behaves just fine, albeit with an Invalid Drive warning.

I fixed that by adding another entry to the whitelist, and now even this drive shows up as preferred.

So please try this with a big HDD and let us know the results.