back to thermal airflow from RS819
Normal operation condition for HDDs is in range between 5-50 degrees Celsius (up to model). But ideal is between 25-40, again up to model.
Why ideal? You can minimize the drive failures, data loss and you keep maxed disk lifespan.
Here is photo of your uncovered NAS:
three 40x40mm fans for airflow from 4xHDDs and entire heat from CpU, MoBo and PSU:
- left one must take airflow from CPU and from Disk no 1
- middle one must take constant heat from MoBo and from PSU + Disk no 2 (more demand for this fan) ... I would like change this one for constant full speed in room operation condition
- last one is for heat carrying from Disk no 4 and max. 20% from Disk no 3
Then Disk 3 heat is taken slowly and there must be heat beaming into Disk 2 and 3.
it’s really better to switch the fans into operation, that will decrease your HDD temp under 40 constantly. Keep your eyes for CPU.