You guys are making me feel old. My father bought my first 20 MiB hard drive used for close to $1000. It was the size of a VCR and sounded like a jet engine.
I'll join in. My first HD was a 40 MB Seagate 5.25 for $900, attached to an Apple //gs.
I once had a Miniscribe 40MB drive that would actually cause the desk to visibly shake when you were reading & writing to it.
My first HDD was 5mb and it would shake the desk from inside the XT computer too :)
That was the first hard drive I ever saw, the very first time I was told about hard drives and learned what a hard drive was.