Do hard drives store data magnetically on the disk? How does the performance of drives with different capacities vary? In what everyday use cases should they be preferred over SSDs? Are they affected by temperature and magnetic fields?
How does an HDD store data and what are its advantages?
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A year ago, I had to fill a 2TB hard drive with lots of large video files for a media archive—only a traditional HDD made sense because the cost per TB was just a few cents. Yes, data is stored magnetically on aluminum or glass disks coated with a thin magnetic layer, with read/write heads flying just a few nanometers above the surface. When I tested different capacities (my old 320GB model vs. today’s 4TB), I noticed right away: higher capacity doesn’t automatically mean more speed—the 5400 RPM models were quieter, but small file access times felt just as slow as the older 7200 RPM variants in practice.
Compared to SSDs, faster boot times and better shock resistance are clear advantages—but for my archive drive running 24/7, pure capacity is what matters. Heat dissipation is crucial here: after replacing a dead 5400 RPM drive in a poorly ventilated case (45°C inside!), I had a sudden head crash, so now my 4TB sits in an external enclosure with its own fan. By the way, strong magnetic fields like speaker magnets can actually erase data if you get too close—the old 160GB from my previous PC gave up the ghost near my monitor speakers.
Bottom line: for bulk data on a budget, HDDs are still the best choice—but when it comes to heat and magnetic interference, you’d better protect them better than I did at first.