Hard Drive Rack How Was The First Computers Hard Drive Made Without A Computer To Write The Data To It?

How was the first computers hard drive made without a computer to write the data to it? - hard drive rack

Ok now I have tried their brains to find an answer dug
How is it possilbe to report to a computer when the hard drive you need a computer to write data?
Im very confused, because this
Does anybody know the answer?