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There are entire lights-out factories containing endless rows of robotically-loaded servowriters chugging away 24x7x365
Most likely! There’s a book about hard drive servo control that includes information on all these kinds of topics: https://www.crcpress.com/Hard-Disk-Drive-Mechatronics-and-Control/Al-Mamun-Guo-Bi/p/book/9780849372537 …
ooh thanks for the recommendation! i am reading it now.
Exactly. There is one on the side where a special "clock head" reaches in to synchronize to the spindle speed, and an arc-shaped one on the underside where an external actuator (with precision optical encoder) reaches in to physically move the drive actuator.
I don’t think this method is used much any more as it’s not accurate enough; instead position feedback is obtained from an optical grating adhered to the arm hit by an external laser sensor, and the actuation is from the normal voicecoil.
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