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My S5's screen died about a week ago and as a result the phone will be getting swapped. It has some pretty sensitive information on it (such as numbers, credit card info, photos, etc.) that I want to get rid of:permanently. Lately I've been overwriting the internal memory using "dd if=/dev/urandom of=/sdcard/junkfile" in ADB and was wondering if this would be enough to make sure my data is gone for good. I've also wiped it about 5 times.

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You've done great so far. Now, write junk files again and encrypt the device over ADB Shell:

/system/bin/vdc cryptfs enablecrypto inplace PASSWORD

(Your device may need to be rooted for this)

Now, feel free to wipe.

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    And for full paranoia-mode, write the junk file again after that :)
    – Izzy
    Commented Jul 14, 2014 at 12:19
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    Repeat 3 times. :p
    – Chahk
    Commented Jul 14, 2014 at 13:53

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