¶ SD Card
The SD Card has a main impact to a device reliability.
Do not use cunsumer grade SD Cards without any rating. The reliability of these types of storage
are not good and significantly impact the dependability of the system.
The optimal the industrial grade SD cards should be used.
If the industrial grade storage is not the option choose sd card with the
rated storage and temperature duration.
The tested cards are
- Sandisk Max Endurance - good, solid, reliable and not so expensive SD Card (temperature and block-live-count rates are part of the SD Card sheet)
- Sandisk Industrial - industrial grade but expensive solution. It is suitable for critical tasks, remote deployment etc.
Let us know at Github Discussion if you tested other types of rated SD cards so we can share it with the community 
.
¶ SD Card mount
SD Card is coverd by Fan Cover. To inser a SD Card the Fan Cover needs
to be removed.
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untight Fan Cover screws
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carefully slide out the Fan Cover and insert SD Card.
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assembly Fan Cover