Hard Drive Seek

How it's made

Source

an already spinning hard disk, not a startup. Rotation at 90, 120 or 166.7 Hz drives a quiet bearing fundamental, housing harmonics and a weaker 8th/16th/24th-order motor whine.

Air

independent pink-noise beds, high-passed at 180 Hz and rolled off at 4.8 kHz, model platter air shear. Small synchronous amplitude and frequency changes keep the spindle alive without a siren.

Actuator

grouped voice-coil accelerations excite 0.3 ms attacks and 2-5 ms band-limited clicks; a quieter braking click follows 4-9 ms later. A 9-20 ms falling noise band models arm travel.

Body

damped chassis responses at roughly 510, 1370 and 2920 Hz decay in 12-35 ms, with the upper modes dying first. Soft mounting darkens the excitation and shortens these resonances.

Envelope

a four-second access phrase has dense 18-42 ms chatter within bursts and pauses between commands. The motor stays running through the gaps; no power-on or power-off fade is baked in.

Variation

seeded timing, stroke, strength, tuning and narrow pan vary each seek. Presets change access scheduling, spindle speed, motor/actuator balance and mounting, rather than only level.

The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.