Could YouTube Ever Run Out of Space?

Every minute, people upload hundreds of hours of video to one website. Not hundreds of videos. Hundreds of hours.

So where does it all go, and can the space run out? The thing that runs out is not space. A question about hard drives ends up being about power stations.

There is no cloud

The word cloud suggests something weightless with no location. There is a building, usually somewhere with cheap land and cheaper electricity.

Inside are rows of metal racks holding ordinary hard drives and solid-state drives, the same kind that is in a laptop.

Your upload travels down a cable, often under an ocean, and lands on a physical object. It lands on several, in different buildings, because a building can burn down.

One upload becomes a dozen files

The file you sent is almost never the file anybody watches. It is re-encoded into a ladder of versions, from tiny ones for a phone on a bad connection up to full size, sometimes in two or three formats.

That is why compression formats matter so much. At this scale, saving 30% is a whole building.

Almost everything is in the freezer

Most of what is uploaded is hardly watched after the first few days: home videos, private uploads, abandoned channels. All of it still has to be kept.

So rarely watched material is moved to slower, cheaper storage. Think of a fridge and a freezer. Some of the coldest data in the industry lives on magnetic tape, which is slow to read and very cheap to keep.

The containers keep growing

A hard drive of a given size has held more every year for decades, and the cost of storage has kept falling. Racks are replaced with denser racks in the same floor space. Old drives are physically destroyed, because of what is on them.

On pure capacity, the answer is no. It will not run out, and it is not close.

Failure is normal

One hard drive is reliable. Put a million in a building and a few will fail today, and every day.

So these systems are built to expect failure. Everything is stored more than once. A copy is cheaper than an apology. Replacing dead drives is somebody's ordinary job.

The real limit is electricity

Every drive is powered all the time. Every video served has to be read, decoded and sent. All of that electricity becomes heat inside a sealed building, and roughly as much power again goes into removing the heat.

A large data centre uses as much electricity as a small city, continuously.

That is why these buildings sit beside hydroelectric dams and in cold countries. The map of the internet is really a map of where electricity is cheap.

And water

Many large data centres are cooled by evaporating water. It works very well and uses a lot. In some dry regions it has become a real local argument.

Underneath the word cloud there is a building, a power line and a water pipe.

Why it is free

Somebody pays for those drives, that electricity and that water, including for the video you uploaded and forgot.

The sums work because a small fraction of what is stored is watched enormously. Advertising against that fraction pays for the whole warehouse. A competitor could buy the drives. It could not buy the habit.

What deleting does

The file is marked as gone and disappears from view at once. That is a label. The actual copies in several buildings are removed on their own schedule, and backups can persist for a set period.

Deleted and gone are two different words.

The short answer

Storage was never the limit. The limit is electricity, then the cooling for the electricity, then the water for the cooling. Data centre projects are already being delayed in several countries because the local grid cannot supply them, and AI now wants the same power.

The most digital thing in your life is a row of hot metal boxes next to a power station.