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Editorial Team
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Asked: 2026-05-25T16:48:42+00:00

I have an application that writes important data to the SDCard and encrypts it

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I have an application that writes important data to the SDCard and encrypts it using AES, which later will be used by a desktop application. I have noticed that if I do not unmount the SDCard from the Settings menu sometimes the files don’t get written at all, or are corrupted.

Is there anyway in Android 2.1 that I can unmount the SDCard programmatically? Because I’m pretty sure that from time to time the users will forget to do this, and I’ll be the one fixing the problems and I really don’t want this.

If this is not possible,what Linux command should I use to unmount the SDCard? Since the application will run on some tablets that have a rooted OS.

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1 Answer

  1. Editorial Team

    You should unmount what’s using the sdcard in the proper order, for example

    umount /mnt/sdcard/.android_secure
umount /mnt/sdcard

    or, probably synchronizing the buffers with the filesystem would be enough

    sync; sync
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