All that is very expensive and requires a very qualified and experienced personnel and a specially developed equipment. So the only safe way to completely remove data from a hard drive is to mechanically grind the magnetic medium off the drive platters or dissolve them in special chemical solvents.īut in order to recover the wiped data using one of these techniques, a hard drive must be disassembled, its platters placed in a precise magnetic field measurement system, and the results of such measurement statistically processed. Wiped data may be recovered even from mechanically damaged platters. Such information cannot be completely removed. These techniques are based on the fact that magnetic medium on the hard drive's platters "store" some information about previously written data. There are some techniques for recovery of wiped data. The latter also conceals the fact that you wiped the data. So if you want to protect your information from a casual snooper, you may safely choose either theĪlgorithm. All of these wiping algorithms make recovery of wiped data with any software-based data recover utility impossible. What algorithm is to choose, depends on your specific needs. This algorithm is military-level secure, but horribly slow. Provides high-grade data wiping by filling the file with a special digital pattern through 35 passes. This algorithm is very secure, but very slow. Provides high-grade data wiping by filling the file with a special digital pattern through 7 passes. The file is wiped using Department of Defense standard 5200.28-STD(7). Provides high-grade data wiping by filling the file with a special digital pattern through 3 passes This algorithm is very secure, but slow. The file is wiped using Department of Defense standard 5220.22-M(3). A slower but little bit more secure algorithm than theĪlgorithm and it also conceals to some degree the fact that the disk or file has been wiped. The file is filled with pseudo-random numbers through 1 pass.
Also it does not conceal the fact that the disk or file has been wiped. The fastest but the least secure algorithm. The file is filled with zeroes through 1 pass.
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