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The maximum capacity depends on the type of SD card. You can find more information on the differences between SD card standards on the SD Association website.
What is the theoretical maximum capacity storage per SD card type?
Sony Walkman devices that can use SD cards support the following standards:
- For micro SDXC cards, the Walkman supports up to 2TB.
- For Micro SDHC cards, the Walkman supports up to 32 GB
- For micro SDSC cards, the Walkman supports up to 2 GB.
Sony doesn't guarantee full compatibility with cards from other brands.