Two questions:

 

1.  Does the free version of unraid server allow 3 data disks + the parity disk, or does the 3 disks include the parity disk (2 data disks + 1 parity)?

 

2.  After initially using the Unraid Server Free version, can I just simply load onto my USB key the Plus version after paying for it and plug it into the Unraid server again and it will then allow me to expand beyond 3 disks without any issues?

 

 

The free version is 2 data disks + (optional) parity.  You cannot have 3 data disks even if you forgo parity.

 

After upgrading to a paid version, all you have to do is copy the ".key" file for your unique USB GUID onto the flash and reboot.  You will then be able to assign more data disks.  Your existing configuration will work fine until you decide to do so.

 

I'd sincerely recommend going for the "pro" version.  In addition to allowing more disks, the cache disk feature is particularly valuable for most users.

Two questions:

 

1.  Does the free version of unraid server allow 3 data disks + the parity disk, or does the 3 disks include the parity disk (2 data disks + 1 parity)?

Two data disks, plus a parity disk.  Three total.

2.  After initially using the Unraid Server Free version, can I just simply load onto my USB key the Plus version after paying for it and plug it into the Unraid server again and it will then allow me to expand beyond 3 disks without any issues?

Upon purchase of the Pro or Plus version you will be sent a registration "key" file.

 

All you need do is put that one additional file in the config folder on the flash drive. (you might need to stop the array and reboot. I don't think it looks for the registration file all the time, but just when first booted.)

 

That's it... no need to load any other "pro" version of unRAID software, the registration key file, once in place, enables features in what you already have loaded.  Once the registration file is in place, you will be able to assign more than 3 devices, and have the ability to define user-security and a cache drive.   Your existing data and disk configuration is unchanged until you change it.

 

Joe L.