Someone is streaming a defrag of a hard drive on Twitch

Desktop:       https://www.twitch.tv/twitchdefrags

Mobile:           https://m.twitch.tv/twitchdefrags

 

Newer HDDs don’t make that much of a sound, this person might have placed a microphone near the HDD (or it could be an older HDD).  A disk defrag can take from around 10 minutes to 3+ hours depending on how much disk fragmentation there is.