CleanMyPC's Shredder module is designed to secure the process of removing files from your computer and make their restore impossible. If you wonder why you would need it, here's the answer: when you just drop a file to the Recycle Bin, its data remains on the disk even after the Bin is emptied. It happens because, actually, you don't erase the data itself but rather its address on the disk. Therefore, there's a chance that ﬁles removed via the Recycle Bin may be brought back by some third-party recovery software.
Meanwhile Shredder allows you to choose an appropriate security level of the cleanup operation. Depending on the selected option, the data of the file is erased and then re-written with zeroes one, two, or three times, which is enough to delete the file for good. For example, you can set the highest security level for deleting some very sensitive information like financial docs or credentials.
That's how it works:
Note that secure erase usually takes more time than a regular cleanup, but you'll be sure nothing would ever raise your files to the surface.
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