Which destruction method completely erases data from magnetic media?

Which destruction method completely erases data from magnetic media?

• A. Degaussing
• B. Overwriting
• C. Shredding
• D. Disintegration

Answer: (A)

Data on magnetic storage is stored as magnetization of tiny domains. Degaussing exposes the media to a very strong, varying magnetic field that randomizes those domains across the entire surface, so the stored bits lose their meaning. With the magnetic orientation effectively erased, reads return nonsense and the information can’t be recovered by ordinary methods. This makes it the most reliable way to completely erase data on magnetic media. Overwriting relies on writing new data, and while it can be effective, it may leave traces or be insufficient if not done perfectly. Shredding or disintegration destroys the physical media, which prevents data recovery but is a destruction method rather than a true erasure of the stored information. Note that degaussing doesn't work on non-magnetic media like SSDs.

Data on magnetic storage is stored as magnetization of tiny domains. Degaussing exposes the media to a very strong, varying magnetic field that randomizes those domains across the entire surface, so the stored bits lose their meaning. With the magnetic orientation effectively erased, reads return nonsense and the information can’t be recovered by ordinary methods. This makes it the most reliable way to completely erase data on magnetic media. Overwriting relies on writing new data, and while it can be effective, it may leave traces or be insufficient if not done perfectly. Shredding or disintegration destroys the physical media, which prevents data recovery but is a destruction method rather than a true erasure of the stored information. Note that degaussing doesn't work on non-magnetic media like SSDs.