Not only does the Security Wipe erase everything, but it also overwrites all the previously used memory so it can't simply be uncovered.
When you delete files on a computer the system simply assigns the file name a "Q" prefix which makes the file invisible and tells the system to go ahead and treat that file as blank space. It gets overwritten when you fill up your hard drive enough so that the space that deleted file takes up is needed for new storage. Data recovery programs just find those "Q" files and rename them so they're no longer invisible. The BlackBerry Security Wipe goes the extra mile and does the overwrite of all those files. Then after they're overwritten it deletes them again. If they were recovered they'd just be jibberish.
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