How to erase the data so that they could not restore the special services?

Data recovery and destruction are two sides of the same coin. To know when and how you can regain information, you need to understand and how it can be destroyed forever. And in some situations it is simply necessary: for example, the destruction of corporate information when disposing of equipment, the destruction of your personal data when transferring a disk to friends or selling, or maybe you want to delete your correspondence history with your mistress once and for all;) It is believed that the best specialists data recovery work in the special services, so we formulated the question in this way: how to destroy information from the disk so that it was not restored by any cops from the “K” department, or Q from James Bond, or yes ie our specialists from StoreLab .

Data destruction programmatically

If you also want to use a hard disk after deleting data, and do not hang around, then you should look in the direction of software methods for deleting data.

Full disc dubbing

There are many algorithms for data destruction through full disk overwriting. But they all boil down to N-fold formatting and writing binary units, zeros and pseudo-random numbers to it. Since the speed of writing to a disk usually does not exceed 70 MB / s, then armed with a calculator, we calculate how much time we need?
The formula is quite simple: Disk capacity (MB) / Write speed * Number of cycles = Seconds;
500000/70 * 7 = 50000 (sec.).
From this we can conclude that a 500 GB disk will “erase” for about 13 hours. But should we use 7 rewrite cycles? Modern information carriers do not leave residual magnetization after overwriting data. Therefore, one cycle is enough for us. It means that we need not 13 hours, but only 1.5.
Operating systems have the tools to completely delete files.
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Windows: