Will be a miracle if it works with ther certified drives, I cannot imagine what you can see with other drives....
No support if you change their original drives but you can put back them in case of a unit failure.
R4 shoud support any up to 4tb hdd.
My R4 arrived DOA just to tell you how is serious this company....they assemble and ship, the final test will be at your home with your waste of time for tests and waiting new units .
I will never buy again from Promise specially at this top prices where you can expect at least a basic quality.
At the Promise website, there is a Pegasus hard-drive compatibility list that shows drives they've tested and certified as compatible with the system. The drives theyve certified include a newer Seagate 3TB drive that is fairly reasonably priced. My short experience (3 weeks) with the re-furbished Pegasus I bought at Newegg has been very positive! FAST and so far, reliable.
You'd need to replace all the drives in the RAID with larger ones before you can create a larger array. Make sure you've checked for all the updates inside Promise Utility so that you can use our latest compatibility list in the Download Center at www.promise.com. If you have any more questions, we'd like to discuss them with you over the telephone. Please call us at 408-228-1500.