Yesterday, 06:03 PM
Regarding your first question, the DX517 expansion unit will not be compatible with the DS916 unless the connection interface matches. Unfortunately, the DS916 is designed to work specifically with the DX513 or DX213. While the DX517 is a newer model, it is unlikely to work due to differences in connection types between the units. You will need to look into options that match the connection compatibility of your current setup.
As for your second question about the DS1821+ and the Ultrastar DC HC590 24TB drives, although the official compatibility list may be small, the DS1821+ is generally more flexible with enterprise-level drives, and the Ultrastar drives should technically work with this model. However, since they are not officially listed, there is no guarantee of full compatibility. Synology’s official lists tend to be more conservative, but it’s always a good idea to confirm through testing or contact Synology directly for more detailed advice if you decide to go this route.
As for your second question about the DS1821+ and the Ultrastar DC HC590 24TB drives, although the official compatibility list may be small, the DS1821+ is generally more flexible with enterprise-level drives, and the Ultrastar drives should technically work with this model. However, since they are not officially listed, there is no guarantee of full compatibility. Synology’s official lists tend to be more conservative, but it’s always a good idea to confirm through testing or contact Synology directly for more detailed advice if you decide to go this route.