How Youtube does not run out of storage space since billions of people are uploading billions of videos since the beginning of Youtube
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Great question with an answer that has to do with how YouTube shares computers with many other systems: Google Search, Gmail are two examples.
Search and Email are systems need to be able to access their data extremely fast. If everyone’s email were on a small number of disks, then reading your emails would be very slow, because the disks would be overworked by all the users.
So instead of filling every disk with email, they put a little email on many disks, leaving the rest of the space available. This way when you read the email the disk holding your email isn’t busy serving other people.
The need for disks to be fast is bigger than the need for the space on those disks.
What does this have to do with YouTube? YouTube videos are very large, and aren’t constantly being watched. They don’t have to be retrieved fast. So to avoid waste: all that leftover space is used by YouTube! It’s filled up by videos!
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