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Das inoffizielle Android-SystemhandbuchDas inoffizielle Android-Systemhandbuch
Buy at Amazon for €4.34
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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SanDisk SDSQUNC-064G-GN6MA Ultra 64GB Android microSDXC Memory Card + SD Adapter up to 80 MB/s Class 10 (Refurbished)SanDisk SDSQUNC-064G-GN6MA Ultra 64GB Android microSDXC Memory Card + SD Adapter up to 80 MB/s Class 10 (Refurbished)
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SanDisk Ultra 64GB Android microSDXC Speicherkarte bis zu 80 MB/Sek, Class 10 (Generalüberholt)SanDisk Ultra 64GB Android microSDXC Speicherkarte bis zu 80 MB/Sek, Class 10 (Generalüberholt)
Buy at Amazon for €8.99
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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Tvird Card Reader SD/Micro SD Card Reader 4 in 1 Memory Card Reader Camera Card Reader with Lightning Connector USB 2.0 Card Reader Adapter for iPhone/iPad/Android/PC LaptopTvird Card Reader SD/Micro SD Card Reader 4 in 1 Memory Card Reader Camera Card Reader with Lightning Connector USB 2.0 Card Reader Adapter for iPhone/iPad/Android/PC Laptop
Buy at Amazon for €11.99
SD Card Reader, Micro SD/TF Compact Flash Card Reader with 3 in 1 USB Type C/Micro USB Connector Adapter and OTG Function, Portable Memory Card Reader for & PC & Laptop & Smartphones & TabletsSD Card Reader, Micro SD/TF Compact Flash Card Reader with 3 in 1 USB Type C/Micro USB Connector Adapter and OTG Function, Portable Memory Card Reader for & PC & Laptop & Smartphones & Tablets
Buy at Amazon for €10.99
Sandisk Ultra Android MicroSDHC 32 GB Memory Card + SD Adaptor up to 80 MB/s Class 10 Memory CardSandisk Ultra Android MicroSDHC 32 GB Memory Card + SD Adaptor up to 80 MB/s Class 10 Memory Card
Buy at Amazon for €7.95
SanDisk Extreme microSDHC 3 Rescue Pro Deluxe Memory Card, Red/Gold 128gbSanDisk Extreme microSDHC 3 Rescue Pro Deluxe Memory Card, Red/Gold 128gb
Buy at Amazon for €15.99
As of 2020-10-25 08:52
prices & availability might be subject to change.
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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

2020-10-25

Automated Deletion

2020-10-25

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)

2020-10-24

Further Readings:

2020-10-25