Old hard drive: only destruction can ensure safety
According to Attingo Data Recovery, the physical destruction of a classic magnetic hard disk (HDD) does not necessarily require an external service provider: with a little tool, you can simply destroy the data carrier disk or "disk" (rotatably mounted disk), This makes it uneconomical to perform professional data recovery. All in all, Attingo only sees one option for sensitive data: encrypt the data carrier from the beginning, then completely overwrite the data, and then perform professional data rescue or authentication on the deleted data. Apply physical damage.
Incredible data carrier destruction needs to be improved.
Not only the ministries, but also companies and private users are faced with the problem of system changes. This involves how old data carriers should be handled. These old data carriers often also contain incorrect data. Should come.
Attingo data recovery instructions :? The data saver works like an archaeologist in some ways: for them, it is not valuable at all, so that people will not do their best to save it. The hard drive and other data carriers are securely erased so that the data can no longer be reconstructed by professionals, so it cannot be ignored ※ In our digital world, there is hardly anything more dangerous than sensitive data. Houses are intact and may fall In the wrong hands.
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large number of commercial deletion programs for software that is often insufficient for data destruction ensure complete deletion of the data carrier and no residual deletion. But, usually, unfortunately, this is just a promise, and less because of the (very good) different qualities of these programs, but because of the way hard drives and flash memory (such as SSDs, USB sticks and SD cards) are structured ※.
To understand why residue-free deletion is actually an "impossible thing," you must first understand how modern data carriers work. The main problems with data deletion are those areas that may fail during operation. Whenever a defect occurs in an area, it is separated and the data is copied to the replacement area. The system can no longer access these blocked areas-that is, it cannot access inappropriate removal software. However, the original data still exists and can then be read by professional data savers using special procedures. ? Taking into account the media with terabytes of storage space, the reserved area occupies several hundred MB, you can measure
Special problems with SSDs, USB memory sticks and SD cards SSDs, USB memory sticks and SD cards have a special problem because the original data of "Wear Balance" is always stored in different physical addresses. Flash memory has more spare memory than hard drives because the life span of each flash memory unit is relatively short.
The data will be distributed across the cells, so if possible, they all have the same number of write cycles. This avoids early failure of areas where frequent write accesses are made. Therefore, once the flash data medium is overwritten, all data will never be destroyed.
Data destruction: State requires coverage of all areas.
By the way, a misunderstanding that is often rumored is that repeated coverage makes erasing magnetic hard disks safer ※. This is based on decades of record design, "non-overlapping traces can still be used." For modern hard disks, the recording density has changed, so one overwrite is enough to prevent recovery of the overwritten sector.
The problem is not the frequency of data coverage, but whether it actually covers all areas. According to the credo of Nicolas Ehrschwendner, managing director of Attingo Datenrettung GmbH, once a single department is covered by data, it cannot be rebuilt.
Self-destruction is not always reliable Most modern data media have standardized self-destruction commands. "If you do this, the data carrier should completely destroy all data-including the reserved area." However, the problem is complicated:
Time and time again, the command is not executed correctly, or the data carrier has shown the first defect, so the self-destruction is incomplete. Similarly, according to Ehrschwendner, it is almost impossible for users to verify successful data destruction.
In addition to the software-based process, the relatively safe method of physical destruction can also "exercise a bit of brutal force" or be implemented with due care. According to these methods, the data carrier is not available and can no longer be used. "True heavy treasures" include shredding and grinding data carriers-one of the safest methods of data destruction: using hard drives, data sectors usually only occupy a few micrometers on the surface, so theoretically small fragments are used The scanning probe microscope can still be read. However, no data protector in the world can put this theory into practice. Due to the budget required for this long-term job, sometimes it sometimes fails.
SSDs and other flash memory data carriers consist of one or more flash memory chips. If mechanical data corruption occurs, all built-in flash memory chips (wafers) must be destroyed. ※ Here, the grain size during shredding should also be smaller than the minimum size of the wafer cast into the chip-the edge length is 1 mm The length should be small enough.
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