SD Cards
SD cards vary in their maximum write speed and also in their energy consumption. For most deployments we recommend using 32GB Sandisk Extreme UHS Speed Class 3 (U3) microSDHC cards. These work at all sample rates, have low energy consumption, and are very well proven in field deployments.
For deployments where larger cards are required we recommend consulting the application note below:
A Comparison of SD Card Energy Consumption
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Other UHS Speed Class 3 will likely work but may consume more energy. Note that there can be significant variation between cards.
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For deployments using sample rates below 48kHz, then slower cards such as Class 10 or UHS Speed Class 1 (U1) cards, will likely work well. Make sure that you test them prior to deployment.
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SD cards typically come formatted in one of two systems. Cards that are 32GB or less in size are normally supplied formatted using the MS-DOS (FAT32) system. Cards greater than 32GB are typically supplied formatted using the exFAT system. Both FAT32 and exFAT file formats are fully supported by AudioMoth.
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