Degaussing and shredding are both recognised ways to destroy data on drives — but they work differently and don't cover the same media. Here's the honest difference, and when each one is the right call.
A degausser erases data by applying a strong magnetic field that scrambles the magnetic domains on a hard drive or tape. Done right, it renders a magnetic HDD unreadable. Two things matter: it only works on magnetic media — it has no effect on SSDs or other flash storage, which hold data electronically, not magnetically — and it leaves the drive physically intact, so the result isn't visible; you're relying on the field strength matching the drive's coercivity and on your verification process. Under NIST SP 800-88 this is a Purge method, for magnetic media only.
A shredder destroys the drive physically — cutting it into pieces small enough that the data can't be reconstructed. It works on everything: magnetic HDDs, SSDs and flash, optical and tape. The result is visible and irreversible. SelecShred™ reduces hard drives to a 1-1/2″ (38.1 mm) strip and SSDs to a 3/16″ × 3/8″ (4.8 × 9.5 mm) cross-cut in a single split-feed pass. Under NIST SP 800-88 this is a Destroy method — the highest assurance level.
Degaussing suits high volumes of magnetic HDDs where you have verification in place — but it can't touch SSDs. Shredding suits any media, mixed streams, and anywhere you need visible, verifiable destruction, and it's the only physical option for solid-state. For the highest assurance on magnetic drives, some operations degauss and then shred. Allegheny Shredders builds the shredding side — if your fleet is mixed or includes SSDs, physical destruction is the path that covers all of it.
| Method | Works on | Result | SSD / flash? | NIST 800-88 |
|---|---|---|---|---|
| Degausser | Magnetic HDD & tape | Magnetically erased — drive intact | No | Purge |
| Shredder | All media — HDD, SSD, optical, tape | Physically destroyed — irreversible | Yes | Destroy |
No. Degaussing only affects magnetic media; SSDs and flash store data electronically, so a magnetic field doesn't erase them. SSDs need physical destruction (shredding) or a verified secure-erase.
For physical destruction to a compliant particle, yes — shredding is NIST SP 800-88 "Destroy", the highest level, and it covers every media type. Some operations degauss magnetic drives first for extra assurance, then shred.
No — we build industrial shredders. If you need to destroy mixed media or SSDs, physical destruction covers all of it; tell us your media mix and we'll match the machine.
Tell us your media mix — HDD, SSD or both — and we'll match the shredder, or see how we handle secure media.
Material, volume, and the result you need at the end. Help us understand your space — direct from the people who build the machine.