UDATE: 27/08/2021 - Synology has added "Incompatible Models" filter for their Product compatibility list of supported HDD/SSDs

As an example, here is how the new filter looks like:

List of "incompatible" HDD models

Do note that Synology will also NOT provide support if you are using u unsupported products:

Synology will not provide technical support if your device is not on the Synology Products Compatibility List.

Guessing this means drives as well, as they do sell drives also.

UPDATE: 25/03/2021 - Added new info on HDD brands supported with the new x21 models
UPDATE: 18/02/2021 - Added info on official plan regarding forcing Synology branded HDDs on Synology NAS lineup
UPDATE: 28/01/2021 - Official info on the new HAT5300 8TB, 12TB and 16TB models
The new 3,5" HDDs from Synology are here - HAT5300 series

Might be a surprise to some, and not others, but looks like Synology has continued to invest and build their drives!

Last year Synology introduced four SSDs and M.2 drives to the market, and by the looks of it, they are not stopping. Numerous retail sites have started reporting on a potential 8 and 12TB HDDs by Synology.

Today, we finally have the official news on these drives. More detail informations on Synology site here:

HAT5300 | Synology Inc.
High-performance, reliable hard drives for Synology systems

Labeled as HAT5300-8T, HAT5300-12T, and HAT5300-16T these 7200RPM drives will deliver enterprise performance over a long period of time with declared 550TB of transfer per year.

Performance over time

Looks like these drives are Toshiba (possibly MG) drives with custom firmware. On top of this it looks like these drives will work only with x17 or newer models, and the new high range NAS units will be compatible only with the HDDs.

To add to this, these HDDs will only work with Synology NAS HW. Will this change remains to be seen.

Here are the official specifications on these 5y warrenty SATA drives.

https://ln.blackvoid.club/hat5300

Some nice stats on these bad boys!
All drives in this class are covered with 5y warranty

Potententily priced at around €350for the 16TB and €250for the 8TB we will wait and see if the prices are true, considering that at the moment there are no official global wide prices out there.

How well these drives will compare with other enterprise HDDs remains to be seen. I have no reason to believe that these models will not perform well, well beyond your regular NAS drives. It is obvious that the HAT5300 series is targeted towards NAS models in the high-end range (XS+ models) there is no reason that you can't use them in other + models for example.

DS920+ at the moment does not have the 16TB model as compatible, but that might change.

So Synology now has a nice lineup of its "own" drives that in time will demonstrate how well they perform and compare to the competition.

Complete HDD and SSD Synology lineup at the moment

Will I have to use only Synology HDDs with all Synology NAS models?

Short answer, no.

These models will be targeted to only specific main and expansion models from specific series.

Information from official Synology presentation for enterprise solutions 2021

As we can see, main storage pools and cache slots will ONLY be able to use Synology official drives (including 3,5", 2,5" and NVMe modules) from the following series:

XS, RPxs, XS+, SA, CA, FA

UPDATE: 25/03/2021

Synology has changed their policy on not supporting any other non-Synology brand HDD in their new lineup of models.

New information has been listed when searching compatible drives for the new models:

We have tested and verified the compatibility of third-party products and peripherals on the Synology Products Compatibility List. Please note that the tests conducted in Synology labs may not have covered every aspect and that changes to firmware or hardware may affect device compatibility and stability. Synology does not guarantee the compatibility with third-party products and peripherals on the List and reserves the right to update the List at any time without prior notice (Learn more).

Synology will not provide technical support if your device is not on the Synology Products Compatibility List.

* Always use and manage 4K native (4Kn) hard drives separately.
4Kn hard drives are supported from DSM 5.1-5021. Use 4Kn hard drives separately from hard drives in other disk sector formats when creating, repairing, expanding and migrating any volume, disk group, RAID group and LUN.

* Always install enterprise-level drives on the FS/SA/UC/XS+/XS series models.
It is highly recommended to use enterprise-level drives on your enterprise-level servers to ensure optimal performance.

Also we can see that the new models have other brands listed for their enterprise class drives:

Make note that the expansion units will also be subject to the same configuration rules as the main/host NAS device.

This means that all SOHO, mid-range models (DSxxxj, play, and "+") will not have this prerequisite.