Back in 1990, I had a 30MB hard drive. And it was full.
Then, in 1994, I had a 400MB hard drive. And it was full.
In 1996, I got a 1GB hard drive. And before I knew it, it was full.
In 1998, I got a 4GB hard drive. A few weeks later, it was full.
...
We have a 1TB RAID array, and it is full.
...
We've just ordered hardware for a 6TB RAID array.
How long will it last?