The Seagate Exos X16 with the product ID ST16000NM001G is basically compatible with Synology NAS systems, but there are a few things to keep in mind:

- The Exos X16 is not explicitly listed on Synology's compatibility lists for the DS723+, but that doesn't necessarily mean it won't work.
- Other users have reported that Seagate Exos X16 models can be used in Synology NAS systems, although they may require low-level formatting or specific settings.
- It is advisable to check compatibility carefully before purchase or use and consult the Synology compatibility list or Synology support if necessary.

In practice, some users have successfully used these hard drives in Synology NAS systems, but specific problems or warnings may still occur. It is therefore recommended to proceed with caution and possibly seek further advice from the Community or Support.