I have a corrupted Micro SD card of which I saved the data already on my PC. I want to throw the Micro SD into the waste because it is bascially useless because my Windows phone gets nuts with it. However I do not want anyone to read the data on it after coindicdentially finding it in the waste since it contains my very personal photos.

Hence I have cut the Micro SD cards into segments as it can be seen in the attached picture. The pin section of the SD cards is basically now cut in 4 parts and I want to throw one half of the segments into another waste container than the other half.

Is this an preventive action that assures no one can ever read any data from this Micro SD card again?

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According to the SANDISK Micro SD datasheet you can see the architecture of a secure digital card. So if you break it in half it should not work as SD cards are made with NAND technology where every transistor is very very small [1-5nm long] which is totally impossible to repair. But I always follow Crash and Burn strategy to retire my old disks. If you want more explanation then there is a nice explanation in Electronics Stackexchange.

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Being unable to read data is very different to being unable to interface with data.

You can take a CD or DVD to understand this better:

  • Find a disc that has been written to.
  • Cut the disc into 4 slices (some shredders do this).
  • Examine the underside. The data is still there.

While the data may still reside there, it would not be practical for someone to attempt to read it with any kind of standard disc drive.

Many enterprises and home users find "data destruction" in this fashion to be sufficient partly due to the facts:

  • Your data isn't the "lowest hanging fruit on the tree".
  • The effort to piece the disc back together just isn't worth it for most individuals.
  • With the volume of other media being thrown out, yours effectively blends in.

If you require a high level of assurance, the following works quite well:

  • Write to the media with zeros, ones, then with a random pattern.
  • Ensure that you pass over the media several times.
  • Separate the storage (platters, flash, NAND) from the controller(s).
  • Throw the controller(s) out unless it/they has/have a non-volatile cache.
  • Physically "attack" the surface and internals of the storage/controller (hammer).
  • Place storage/controller into a high temperature furnace or lava flow.
  • Take the remnants and spread randomly over a public green space.
  • Water said locations.
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