Here's that being done and also with fan noise: https://www.securityweek.com/hard-drive-noise-allows-data-theft-air-gapped-computers https://www.securityweek.c

Here's that being done and also with fan noise: https://www.securityweek.com/hard-drive-noise-allows-data-theft-air-gapped-computers https://www.securityweek.com/hard-drive-noise-allows-data-th... 180 bits per minute, not too shabby!