SD Card
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The Raspberry Pi should work with any compatible SD card, although there are some guidelines that should be followed:
SD card size (capacity)
For installation of the NPS-ANPR the minimum card size is 8GB.
Note: Only the Raspberry Pi 3A+, 3B+ and Compute Module 3+ can boot from an SD card larger than 256 GB.
SD card class
The card class determines the sustained write speed for the card; a class 10 should be able to attain 10 MB/s. However, it should be noted that this does not mean a class 10 card will outperform a class 4 card for general usage, because often this write speed is achieved at the cost of read speed and increased seek times.