Android Adoptable Storage:
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https://android.stackexchange.com/tags/adoptable-storage/info
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Everything you need to know about your SD card and Adoptable storage: https://www.androidcentral.com/adoptable-storage
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Adoptable storage on Android: What is it and why does it matter? https://androidkenya.com/2019/03/adoptable-storage/
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PSA: You can do a lot more with adoptable storage than you think: https://old.reddit.com/r/Android/comments/n843in/psa_you_can_do_a_lot_more_with_adoptable_storage/
About enabling it:
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How to free Internal Storage by moving data or using symlink / bind-mount with Adoptable Storage?: https://android.stackexchange.com/questions/214233/how-to-free-internal-storage-by-moving-data-or-using-symlink-bind-mount-with-a/214706#214706
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How to use a MicroSD as internal storage on your smartphone: https://www.nextpit.com/how-to-format-microsd-cards-as-internal-storage
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How To Use SD Card As Internal Storage: https://fossbytes.com/android-sd-card-internal-storage-adoptable-storage/
Abilitation workarounds:
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Use your microsd card as internal storage (no root) (Xiaomi): https://old.reddit.com/r/Xiaomi/comments/cgpowr/use_your_microsd_card_as_internal_storage_no_root/
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How to turn a portable SD card into internal storage via ADB command? https://stackoverflow.com/questions/38044532/how-to-turn-a-portable-sd-card-into-internal-storage-via-adb-command
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Marshmallow, LG and Adoptable Storage : https://jimcofer.com/2016/03/10/marshmallow-lg-and-adoptable-storage/
Notes:
- (From AOSP docs) Adopted devices must be formatted with a filesystem that supports POSIX permissions and extended attributes, such as ext4 or f2fs. For optimal performance, the f2fs filesystem is recommended for flash-based storage devices.