Synology has released DSM 5.2-5644 Update 2. This update is different than other updates in recent memory as it has only been pushed to some Synology NAS Models. It only fixes bugs and they've only updated models which might be affected. If your Synology NAS supports expansion bays, high-availability clusters or is a XS/XS+ models then it should receive an update.
- Improved the compatibility of WD Red hard drives with Synology expansion units.
- Improved the stability when running memory test in Synology Assistant on XS/XS+ models.
- Fixed an issue where the passive server in the high-availability cluster might take up too much space in the system partition when storing system statistics.