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Das inoffizielle Android-SystemhandbuchDas inoffizielle Android-Systemhandbuch
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SanDisk Ultra 64GB (SDSQUAR-064G-GN6MA) microSDXC Memory Card + Adapter up to 100 MB / s, Class 10, U1, A1, Gray, RedSanDisk Ultra 64GB (SDSQUAR-064G-GN6MA) microSDXC Memory Card + Adapter up to 100 MB / s, Class 10, U1, A1, Gray, Red
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Sandisk Ultra Android 64GB MicroSDXC Memory Card Up to 80 MB/s – Class 10Sandisk Ultra Android 64GB MicroSDXC Memory Card Up to 80 MB/s – Class 10
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ARCANITE microSD Memory Card with Adapter 64 gbARCANITE microSD Memory Card with Adapter 64 gb
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SanDisk Ultra 128GB MicroSDXC Memory Card + SD Adapter with A1 App Performance up to 100 MB/s, Class 10, U1SanDisk Ultra 128GB MicroSDXC Memory Card + SD Adapter with A1 App Performance up to 100 MB/s, Class 10, U1
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SanDisk Ultra Android microSDHC 16 GB up to 80 MB/s, Class 10 Memory Card with SD Adapter 64GBSanDisk Ultra Android microSDHC 16 GB up to 80 MB/s, Class 10 Memory Card with SD Adapter 64GB
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SanDisk Extreme PLUS 32 GB microSDHC memory card + SD adapter up to 100 MB / s, Class 10, U3, V30, A1SanDisk Extreme PLUS 32 GB microSDHC memory card + SD adapter up to 100 MB / s, Class 10, U3, V30, A1
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Vanja SD/Micro SD Card Reader, Micro USB OTG Adapter and USB 2.0 Memory Card Reader for SDXC, SDHC, SD, MMC, RS-MMC, Micro SDXC, Micro SD, Micro SDHC Card and UHS-I CardsVanja SD/Micro SD Card Reader, Micro USB OTG Adapter and USB 2.0 Memory Card Reader for SDXC, SDHC, SD, MMC, RS-MMC, Micro SDXC, Micro SD, Micro SDHC Card and UHS-I Cards
Buy at Amazon for €8.99
SanDisk Ultra microSDHC memory card + SD adapter with A1 app performance up to 120 MB/s, Class 10, U1SanDisk Ultra microSDHC memory card + SD adapter with A1 app performance up to 120 MB/s, Class 10, U1
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As of 2021-04-11 17:11
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Safe Data-Wipe

The day will come: your good-old Android shall get replaced by a newer model. If you no longer need the "old one", you probably want to give it away. But you certainly don't want the new owner accessing your sensible data which might have been stored on it. So what to do?

There's of course the Factory-Reset. But does it really sanitize your data in a way they cannot be (easily) restored? Unfortunately, that's not the case: though they are deleted, they are not wiped – so with the right tools, they could be restored. Admitted, that takes some little knowledge and work – but it's possible. A good counter-measure is to really "nuke" or "wipe" the storage – i.e. overwrite it with "random patterns". Corresponding guidelines are described by the National Institute of Standards and Technology (NIST) in a PDF Dokument.

Secure Wipe

2021-03-25

Automated Deletion

2021-03-25

Not quite a safe wipe as described above – but still a welcome helper: automatically do a factory-reset / delete all files, if the number of unsuccessful unlock-trials exceeds a certain threshold. That at least makes it more difficult for the attacker to access your data. Unfortunately, none of the few apps in this group is available anymore.

De-Deletion (Recovering)

2021-03-25

Further Readings:

2021-03-25