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I have three older hard drives just sitting around, I put them in and have been testing them to see how this unit would react, so far not one hiccup. I'm going to add four Seagate IronWolf Pro ST10000NE0004 10TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drives later this week. If all goes well, later I'll add my second TR-004 to my TS-253Be. (according from Qnap Two TR-004 is the max you can add to compatible Qnap Nas systems)

very good build

Perfect for me - just wanted a simple NAS for data backups. I plugged it in and in 1 minute it was booted and on-line taking on data. Didn't have to touch a thing. I didn't install the Navigator. The web-based settings interface is easy to use and everything it does seems to be perfectly clear. I did turn on the DLNA service - yes it instantly shows up as a source on my "smart" BluRay player.

This QNAP runs quickly and quietly. The VM is Microsoft Server 2019, and it is very fast. I have it configured to boot off of a RAID-1 SSD drive array, and the AMD Ryzen processor is very fast. Adding RAM and the SSD drives was EASY. Very nice design on the case, easy access 3 screws and that was it. I added five 16-TB drives in RAID-5, and it is used as a Veeam Offsite Repository target server.

Unit comes with 8 mb of RAM. Upgrading to 32 was easy and allowed use of the more advanced QTS Hero software.

Affordable. And works very well

Works superbly. Easy to setup. Very good management software. Lots of other users (e.g. on Reddit). Bought empty, and populated with four (4) 6TB drives (WD6001F4PZ-49CWHM0). More storage than I'll need for a decade.

I was impressed with how the unit was packaged, the included accessories and the unit's design. UGREEN'S attention to details is top notch. I easily installed both of my drives on the unit's HDD rails, slid them in and booted up. I opted for a local configuration only (no UGREEN ID or web access) over LAN. UGOS is minimal but effective: configuration, diagnostics, basic apps, user management, etc. I also installed the UGREEN NAS app on my iPhone, which also works good.

Worked out of the box. I didn't feel like experimenting, so I used Synology ECC RAM and Synology NVME cache drives to upgrade it. I'm sure cheaper parts would work, but that's for someone else to experiment with. I also have a DX517 connected. Moved the drives, and the volume, from a DX517 (connected to a DS1520+) to this DS1821+ after installing one blank drive to get DSM up and running. It found that 5-disk volume and I then allowed me to add a 6th with no issues. I then attached the DX517 with 5 new drives and created a Storage Pool and a new volume. This unit worked on creating the new volume, adding another drive while optimizing the original volume, and storing new files at the same time. The CPU never ran over 40%. DRAM was never over 10%. I don't have a use for more than 8GB. Most people won't have a use for more than the 4 it comes with. Both DIMM modules are replaceable with up to 16GB each. I used Synology's SHR RAID with 1-drive fault tolerance on both Storage Pools and the Synology's implementation of Btrfs.

This was an excellent purchase. Arrived very quickly, 2 days earlier than promised. Had seriously good packaging to protect from possible shipping accident. Setup was easy. There are at UG tutorials and youtube videos to aid if you have questions. There is lots of flexibility renmixing hdd's or m2's and no brand restrictions as some other NaS brands have. I install 7TB of storage which works well for.my home LAN. After 3 weeks use of the "2800" I am totally happy.

- Easier than I expected to setup; - smaller than I expected, which is great!; - quieter than I expected! Overall Im surprised with the quality, ease of use and speed.