Why, yes, I do have a 42U rack in my basement, thank you for asking.

Doesn’t everyone?

I’m ashamed to say mine is not even half full, and two of the computers in it aren’t in rack-mount enclosures.

Also shown are some of disks I’ve benchmarked. The one in the dock is a Western Digital WD20EARS, the other three are (from front to back) a WD10EARS, a WD20EADS and a Hitachi HDS722020ALA330.