On Android devices, the standard OS is divided into system, data, and sometimes super partitions (or A/B slots). The system partition (1-2GB, depending on the device’s age) allows quick OS reverts without data loss.

However, some user interfaces require more storage, and you’ll quickly run out of space when installing new software or adding new files.

The userdata partition: This is the partition used by Android to store user data. If you install to this partition, your Android data will be reset!

SD card: On devices with an external storage slot, you can flash the postmarketOS system image onto an SD card.