You can change the drives to anything compatible, as long as they're all identical. The current formatted capacity is 9.2 TB due to RAID5. You can change it of course. The unit may have very minor cosmetic imperfections, but it's in perfect working condition.
The drives are all physically unlocked, and the lock key was lost a long time ago, but they're pretty standard and you can find them online or in hardware stores if you really care. The unit ships with no power cord. Unfortunately I'm moving and I already packed them somewhere else. But it's a standard power cord, and if you are interested in this, you likely already have more than one laying around.The item "QNAP NAS TS-659 Pro II, 4 GB RAM, Network Attached Storage Server" is in sale since Monday, March 1, 2021. This item is in the category "Computers/Tablets & Networking\Drives, Storage & Blank Media\Hard Drives (HDD, SSD & NAS)\Network Attached Storage". The seller is "natales" and is located in Tacoma, Washington. This item can be shipped to United States.