Storing and Manipulating Files
Pradeeka Seneviratne · Apress eBooks · 2018
micro:bit provides a persistent file system that allows you to store files in the flash memory. The size of the storage reserved for the file system is approximately 30KB. However, micro:bit provides a flat file system, so you can't store files in directories to create a hierarchy. The stored files will remain intact until you either delete them or re-flash the device.