CompTIA A+ Core 2 (220-1202)SecurityMedium
A system administrator needs to securely erase data from a hard disk drive (HDD) before decommissioning it. The drive contains highly sensitive company data, and the administrator wants to ensure that the data is irrecoverable. Which data destruction method would be most appropriate and effective in this scenario?
- AStandard format
- BLow-level format
- CDegaussing
- DSimple file deletion
Show answer & explanationAnswer & explanation
Correct answer: C. Degaussing
Degaussing uses a strong magnetic field to completely randomize the magnetic domains on an HDD platter, making all data irrecoverable. This is considered a highly effective and secure method for destroying data on HDDs, especially for sensitive information.
Why the other options are wrong
- A. Standard formatting only removes file system pointers, leaving data recoverable with forensic tools.
- B. Low-level formatting writes zeros to the disk, which is better than a standard format but still potentially recoverable by advanced techniques; degaussing is more absolute.
- D. Simple file deletion only marks space as available, leaving data fully intact and easily recoverable.
Degaussing
The process of reducing or eliminating a magnetic field. In data destruction, it involves using a powerful magnetic field to erase data from magnetic storage media (like HDDs), rendering the data unrecoverable.
- Erases data on magnetic media (HDDs, tapes)
- Uses a strong magnetic field to randomize data
- Makes data irrecoverable
- Does not work on solid-state drives (SSDs)
Memory trick: Degaussing blasts your hard drive with a magnet, making data disappear like magic.