Here are some useful sites for information about older hard drives.

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https://stason.org/TULARC/pc/hard-drives-hdd/index.html

https://www.computerhope.com/history/hdd.htm

https://www-03.ibm.com/ibm/history/exhibits/storage/storage_chrono20.html

http://hddscan.com/doc/HDD_from_inside.html

http://museum.ipsj.or.jp/en/computer/device/magnetic_disk/index.html

http://chmhdd.wikifoundry.com/

https://obsoletemedia.org/data/disk/

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