Just a question i have forget the answer too!

[davegv]

I have a PR4100 with 4 WD Red 6 TB set up as JBOD I want to purchase 2 WD Red 12 TB and replace 2 drives and i cannot remember if all drives must be the same size for JBOD setup if they do this upgrade is going to get much more expensive!
EDIT

Mixing Drive Sizes

Can I put different size drives in the 4 bays of the PR4100? For example, can I put a 4T drive in bay 1, a 6T drive in bay 2, and two 8T drives in bays 3 and 4?

I found this thread that seems to have answered my question, however I will likely save some $ and upgrade all of them… thanks

[cat0w]

@davegv
Have you asked your question in the sub-forum for your device? Are you using OS3 or OS5?