15/10/2025 20:01
emage כתב:
לא התכוונתי לסינולוגי אלא לסרטון על ה-NAS של Minisforum.
בדקה 2:55 הוא מתלהב שהמכסה הקדמי מחובר עם מגנטים...
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כפי שזיו ציין, מגנטים ברמה כזו לא ישנו כלום:
To affect (disrupt, erase, or damage) the data on a hard disk drive (HDD), the magnet must be relatively strong:
### 1. Magnetic Field Strength (Gauss/Tesla)
- **Standard fridge magnets** (50–100 gauss, 0.005–0.01 tesla): *Too weak* to affect modern HDDs.
- **Typical neodymium rare-earth magnets** (2,000–5,000 gauss, or 0.2–0.5 tesla): *Can disrupt* data if placed directly on the platters, but not reliably through the external casing.
- **Professional degaussers** (6,000–20,000 gauss, or 0.6–2 tesla and up): *Guaranteed to erase* or destroy data on HDDs quickly.
### 2. Realistic Use Cases
- The aluminum shield and casing of the HDD protect the platters, so casual exposure to magnets (even strong ones) usually doesn't cause instant data loss.
- Only **very strong neodymium magnets placed right on the exposed platter** may scramble data, and even then it often causes physical damage rather than just logical erasure.
- For **reliable data sanitization**, dedicated degaussers (designed to emit a powerful, controlled magnetic field) are used by IT professionals and labs.
### 3. Manufacturer Guidance
- Consumer electronics are generally safe from most household magnets.
- To confidently erase or destroy data, you need a **magnetic field of several thousand gauss**, applied very close to the platter.
### Practical Thresholds
- **Below 1,000 gauss:** Unlikely to cause harm.
- **Above 2,000–3,000 gauss:** Possible to corrupt data if applied directly on exposed platters.
- **Above 6,000 gauss (~0.6 tesla):** Consistently damages or erases magnetic data, especially with a pulse or alternating field.
### Summary
A magnet **must be several thousand gauss (0.2 tesla or more), applied directly to the HDD platters (not just the casing),** to reliably affect or erase data. For safe degaussing, professional tools at 6,000–20,000 gauss and up are used. Everyday magnets—including most strong project or fridge magnets—are almost never powerful enough to threaten HDD data in a cased drive.