Discussion Overview
The discussion centers on the rotational speed of the actuator arm in hard disk drives (HDDs), specifically regarding its actuation speeds and potential applications in designing a fast shutter system. Participants explore the relationship between seek time, full stroke time, and the implications for using the actuator arm in a shutter mechanism.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
Main Points Raised
- One participant inquires about typical actuation speeds of HDD actuator arms for designing a fast shutter system.
- Another participant references a Wikipedia article on seek time, noting that 10 milliseconds is a typical average but not necessarily the worst-case scenario.
- A different participant provides information on full stroke times, indicating that it typically ranges from 15 to 20 milliseconds, with a specific example of 21 milliseconds from a Western Digital diagnostic report.
- One participant suggests that the peak speed of the actuator arm would be significantly higher than the average speed derived from seek times, and discusses the potential for mechanical stopping without needing a deceleration phase.
- Another participant introduces the concept of using electro-optic approaches, such as Pockels cells, for fast shutter systems, although this is met with confusion regarding its relevance to HDDs.
- There is a side discussion about the differences between rolling shutters and global shutters in cameras, with one participant expressing a preference for global shutters due to their performance in capturing fast events like lightning.
Areas of Agreement / Disagreement
Participants express various viewpoints regarding the actuation speeds and their implications for shutter design, but there is no consensus on the exact speeds or methods. Some participants challenge the relevance of certain suggestions, indicating a lack of agreement on the best approach.
Contextual Notes
The discussion includes references to statistical averages and specific examples of seek times, but does not resolve the uncertainties regarding the peak speeds of actuator arms or the best methods for implementing a shutter system.
