Audio spectrogram of real 5400rps disk (90hz main tone)
Sample of "5400 class disk" being actually 7200rpm one (120Hz main tone)
And another similar drive
Thread on the topic in German https://www.hardwareluxx.de/community/threads/crystaldiskinfo-zeigt-fakewert-an-alle-wd-my-book-8tb-drehen-anscheind-mit-7-200rpm.1235655/
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