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I want to sell an old Android phone. How can I delete sensitive data on my Android phone with a MicroSD card from within Ubuntu, in a secure manner?

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up vote 5 down vote accepted

You can erase SD card using a command line tool called shred (manpage)

You can also refer to this discussion in askubuntu. How to delete file(s) in secure manner?

OR

Here is a tutorial (but you don't need live cd, if you are on ubuntu) - http://www.howtogeek.com/howto/15037/use-an-ubuntu-live-cd-to-securely-wipe-your-pcs-hard-drive/

For deleting everything on phone, Hard reset is OK. But I recommend flashing the original phone firmware. You can get instructions at XDA

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Is it established that any existing methods of overwriting data are sufficient to prevent any possible data recovery on flash media? Almost all the research in this areas applies specifically to magnetic hard disks. –  Eliah Kagan Mar 26 '13 at 12:37
    
I have reinstalled CyanogenMod on that phone. So that is really enough to delete all the data on the phone in a secure manner? –  BuZZ-dEE Mar 27 '13 at 10:47
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You can try in terminal:

 shred –remove –iterations=<num> <file>

e.g. : cd your memorycard name ls (to list the files) shred -remove -iteration=50 yoursensitivedatafile name

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