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A comment on Multiple Western Digital 5400RPM drives are actually 7200RPM drives.

Re:Multiple Western Digital 5400RPM drives are actually 7200... by srtjstjsj on Wednesday September 02, 2020 @01:00PM (#24355206)
Can HDs be (safely and effectively) slowed down by the user, with appropriate drivers? If not, why not?
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Re:Multiple Western Digital 5400RPM drives are actually 7200... by toast0 on Wednesday September 02, 2020 @01:21PM (#24355450)
Most likely not. The motors are most likely fixed speed. Even if not, the speed is unlikely to be setable through the sata interface, you would need to adjust the firmware --- and it's not usually a good idea to adjust hard drive firmware without deep knowledge.
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Re:Multiple Western Digital 5400RPM drives are actually 7200... by hn_acc_2 on Wednesday September 02, 2020 @01:14PM (#24355349)
No, the drive motor rpm is not controlled by OS drivers but by the drive controller. You'd have to write custom firmware and flash it onto the drive controller (inside the HDD) to change the rpm
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