Android devices were connected to PCs directly ( USB Mass Storage) just as we connect a USB drive these days.When the internal storage grew in size, same filesystem was shifted to internal (still called "external") SD card.īut the FAT/vFAT implementation had two major issues which were addressed by Google gradually: Read Android's Storage Journey for details, the summary is:Įarly Android devices were short on internal storage and relied on (physically) external SD cards that traditionally use FAT family of filesystem to ensure compatibility with most of the PCs (refer to Microsoft's dominance on PC world).
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