Security Alerts & News
by Tymoteusz A. Góral

#895 How to delete your smartphone data securely before selling your device
Some people change their smartphone or tablet almost as casually as they change their clothes. They buy and later sell mobile devices without the slightest concern about the information that, one device after another, they keep putting in the hands of total strangers. This article is aimed at all those people, and in it you will be able to learn what measures you can take to protect your privacy.
When you delete a file, is the data really deleted?

Unfortunately, no. With most IT equipment, deleting a file means telling the system that the next time it needs to write data, it can overwrite the space used by the file in question.

However, until the new write operation takes place, the information remains physically stored in the form of bits on the corresponding storage drive and can be recovered. This kind of deletion is known as logical deletion and is the procedure that almost all operating systems use.

In contrast, there is another kind of deletion called physical deletion which modifies the data bit by bit, by creating junk content on the storage medium. This procedure ensures that the data cannot be recovered, but it takes much longer and therefore usually is considered undesirable for tasks where the user experience is central.
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#895 How to delete your smartphone data securely before selling your device
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