220-1102 Operational Procedures Practice Question
A company is decommissioning several workstations that contain confidential client data on traditional HDDs. The company's data disposal policy requires that the data be completely unrecoverable. Which method should the technician use to achieve this?
⚠ Common exam trap
Many candidates choose degaussing (Option C) because it sounds definitive, but they overlook that degaussing may not fully erase modern high-density drives and does not physically destroy the media, whereas shredding guarantees unrecoverability.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Physically shred the hard drive platters
Physically shredding the hard drive platters destroys the magnetic media, making data recovery impossible regardless of any software-based or degaussing attempts. This method aligns with the company's policy requiring data to be completely unrecoverable, as it eliminates the physical medium that stores the data.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Perform a quick format of the drive
Why it's wrong here
A quick format only rewrites the file system metadata, such as the boot sector and allocation tables, marking the drive as empty without touching the actual data sectors on the platters. The confidential files remain physically present in the storage area and can be trivially reconstructed with widely available recovery utilities like TestDisk or Recuva. This approach is suitable for preparing a drive, never for destroying data, and fails even the most basic sanitization standard.
- ✗
Overwrite the drive with a single pass of zeros
Why it's wrong here
Overwriting with a single pass of zeros writes a uniform pattern to every addressable sector, but forensic-grade magnetic force microscopy can still detect residual magnetization left by prior writes—a phenomenon known as data remanence. Additionally, bad sectors and reallocated sectors are often excluded from the overwrite, letting old data fragments persist in areas the operating system cannot address. Because modern drives have extremely tight bit spacing, a one-pass overwrite is considered a clear but not purge-level sanitization method and is insufficient for highly confidential data.
- ✗
Use a degausser to disrupt the magnetic field
Why it's wrong here
A degausser applies a powerful, alternating magnetic field to randomize the magnetic domains on the platters, but it does not guarantee complete erasure with modern perpendicular recording drives that have high coercivity (often 7,500 oersted or more). If the field is not strong enough, some magnetic transitions remain and can theoretically be recovered; moreover, degaussing often bricks the drive by destroying the servo tracks while leaving user data partially intact. Additionally, degaussing does nothing to data stored in solid-state media that may be present in hybrid systems, making it an unreliable choice for highest-level destruction.
- ✓
Physically shred the hard drive platters
Why this is correct
Physical shredding forces the platters through a disintegrator, shattering the rigid aluminum or glass substrate into micrometer-sized fragments and destroying the magnetic coating where data resides. Because the read/write channel relies on a continuous surface to reconstruct flux transitions, even microscopic fragments no longer contain a usable magnetic signature that can be reassembled. Shredding meets NIST SP 800-88 recommended destruction standards for top-secret sanitization and is the only option here that guarantees data recovery is virtually impossible, making it mandatory for decommissioning systems with confidential information.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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