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Giriş
Data destruction on hard drives is comparatively easy, either by overwriting, though this may take a long time, or more securely by physical destruction. However, with solid state disks (SSDs) and memory sticks, physical destruction is the only safe method. This is because data is not written to fixed locations as on a hard disk, but is stored in whichever are currently the least used memory cells. This is so as to spread out the wear caused by every write operation - something that doesn’t happen with hard disks. As a result, old copies of data are likely to persist in memory cells that you can’t directly access, except with forensic tools.
The smart thing to do is to enable encryption before you write any sensitive data, then all you have to do is change the key or unlock code to something totally random and destroy any record of it, and no one will be able to recover your data. On Windows, you can use Bitlocker, or FileVault on Macs. You can use either of those on memory sticks, or Veracrypt, which also works on Linux. You should always encrypt your memory sticks as they are so easily lost.
If you were looking to destroy data on a hard disk, take a look at my companion guide here How to safely and securely destroy hard disk data
Neye ihtiyacın var
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The first step is to open the device in order to expose the storage chips.
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In the case of an SSD, if you're lucky you may only have to remove the screws holding the lid on (ignoring warnings about voiding the warranty). Otherwise, and for other devices, look for any crack between two halves of the case which might give you a weak point you can work on. You may need a hammer or a dremel with a cutting disk.
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When you get inside you will see a circuit board with components on one or both sides. The largest of these will be the memory chips, and may be mounted on both sides of the board. There will be one or more similar looking but smaller controller chips which you probably don't need to worry about.
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With the device on a firm surface, place the tip of the cold chisel across the middle of the memory chip and strike the cold chisel firmly with the hammer.
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The chip should split neatly in two. Half of it is likely to take flight - make sure there are no children around with their eyes at a similar level to the chip.
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Repeat for all other memory chips on both sides of the board.
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To reassemble your device - err, forget about it!
But please dispose of the remains of your day’s work responsibly, in a manner appropriate for electronic waste.
To reassemble your device - err, forget about it!
But please dispose of the remains of your day’s work responsibly, in a manner appropriate for electronic waste.
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What if you preserved the file but wrote other stuff to it? I mean, if it's a spreadsheet, change all the numbers to zeros. Does the "Save" operation write back to the original file-location on the SSD, or does the "wear-leveling" write the saving file to somewhere else?
Oh yes - you missed an even more guaranteed method of data-destruction: fire. It's a shame I can't add pictures to my comment - I could show my blowtorch reducing the SSD to powder. No fragments of chip remain (a really determined expert might scan the semiconductor matrix to retrieve patterns of 1s and 0s to reconstruct partial file components!😂)
If you change just 1 bit in a file on an SSD it will rewrite it to a different block. SSDs only allow you to do 2 things: clear a whole block to zeros, and write ones. You can't write zeros individually and hence you can't overwrite data like you can on magnetic media.
Burning will certainly defeat any adversary you're likely to meet (unless, perhaps, you're James Bond). But beware of noxious fumes - burning electronics is not generally considered a good idea. And in fact, the melting point of silicon is 1414C so the chips will probably survive intact. They briefly survive 350C during soldering but I don't know how much higher you have to go to cause the electrostatic charges storing the data to be lost. That uncertainty would probably cause James Bond to favour the dremel.
Another possible method would be to microwave it. It's extremely unlikely that a chip would survive the very intense electric fields. But your microwave probably wouldn't smell too sweet afterwards. Again, the uncertainty as to whether a chip could conceivably survive would favour the dremel for our friend Mr Bond.