Fairphone 2 secure deletion

Getting your soundcard to work, using Debian on non-i386 hardware, etc

Fairphone 2 secure deletion

Postby Deblib » 2018-04-22 16:15

I would like to make a secure deletion from my computer with Debian 9 of a Fairphone 2 (with Fairphone Open OS) so that someone else can use it. It has a flash memory of 32 GB. Can you guide me? Thank you.
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Re: Fairphone 2 secure deletion

Postby jibberjabber » 2018-04-22 18:07

See:
Code: Select all
man dd

If the manual is not enough , a tiny bit of search foo:
Copy paste these keywords:
Code: Select all
How to wipe a drive using dd

into your favourite search engine,
1 of several hundred results:http://how-to.wikia.com/wiki/How_to_wipe_a_hard_drive_clean_in_Linux

Oh, and you should read this: Please Read.. What we expect you have already Done.
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Re: Fairphone 2 secure deletion

Postby pylkko » 2018-04-22 21:10

If the phone has the Android file hierarchy, please remember that if you dd everything, you will likely brick the device. For example, you probably want to be able to boot the phone into recovery or bootloader mode! On standard android file hierachy the user's data is in whatever is mounted at /data and cache files are in /cache.
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Re: Fairphone 2 secure deletion

Postby jibberjabber » 2018-04-22 21:27

Oh, no, apology , I misunderstood this ;
I would like to make a secure deletion from my computer with Debian 9 of a Fairphone 2 (with Fairphone Open OS) so that someone else can use it.
I thought the OP wants to remove the data from the PC,.... any way
sorry about that.

In any event, a search still gives a lot of information:
Fairphone 2 secure deletion
The first hit:
https://support.fairphone.com/hc/en-us/articles/115001610926-How-to-return-to-Factory-settings-on-my-Fairphone-2
Or maybe you want to sell the phone to someone else?
In either case, you might want to erase all the information stored on your device. Let us show you how to reset your Fairphone 2 to factory settings.

Please note

A return to Factory Settings will delete all your data!
Before you perform the reset we recommend - if possible - to make a thorough backup. Save your pictures, music and all private files or make a mirror image of the content of your phone. You can save them on a micro-SD card, on your computer or synchronise with your Google account.
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Re: Fairphone 2 secure deletion

Postby Deblib » 2018-04-26 09:49

Deblib wrote:so that someone else can use it.

But going back to the factory settings is not a safe deletion. What I want is for my data to be irretrievable. Is making dd on /storage/emulated/0 the right path?
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Re: Fairphone 2 secure deletion

Postby pylkko » 2018-04-26 12:46

It is widely believed that data cannot be recovered from flash media after overwriting it with dd, except by instances like the CIA, GCHQ and some friends of Vladimir Putin. If you want to be paranoid you can do several passages, first writing ones then zeros and then random.

What locations you should clear depend on what tweaks to the operating system (android?) the manufacturer has done.
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