Microscience 3.5" full height units, such as the 7100. They have a really cool sounding start-up seek noise. I have an ESDI version, the 5100, but unfortunately it has bad bearings.
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Also 2nd the Maxtor 7120AT. Love that whistle. Am also a huge fan of the Conners... the start-up buzz and *loud* ratchety seeks are unmistakable.
Also quite like the Quantum Fireball TM drives, especially the ones with the simpler "stamped metal slab" top. Those make a nice, rumbly, grumbly ratchet sound when you run Windows 95's Defragmenter on them.
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Some of the silver Western Digital AC2540 and 2850 drives have a superlatively hollow sounding seek rattle - the ones that have empty pads for a PLCC chip on the bottom of the PCB and a 'WDC (C)1995' silkscreened on the board sound much hollower than the other drives without the empty PLCC chip pads for some reason.
Not an IDE hard drive, but the Maxtor Atlas 10K V has an awesome start-up seek pattern. Some Seagate Cheetahs and IBMs have similarly cool sounding seek pattern, albeit with less "beatbox".
https://youtu.be/SeRcXziutbg
Life isn't long enough to re-enable every hidden option in every BIOS on every board... 🙁