Wow, major early career flashbacks. That cabinet looks like the ones our customers used to store their removable hard drives in the 70's-80's. Depending on the size of the operation they would have anywhere from 1 cabinet, to whole rooms with the walls lined with those things, and huge drive machines lined up like washing machines in rows filling up the center of the rooms.
I remember the Sports Illustrated offices in Manhattan had hundreds of disks, I don't know how many drives, lots. A technician was showing me the next issue layout, how they were computer enhancing the images. This was not a common thing back then, he said just about every image in the magazine would be digitally enhanced, blew my mind, Lol.
This is a 300MB pack, the largest at the time. Yes, that is correct, MB, not GB. You would open the top cover of the drive unit (like a top loading wash machine), place the disk in, twist it clockwise to seat it on the drive spindle, then twist counter-clockwise to remove the plastic cover, close the drive lid, hit a button and it would spin up. I can't remember the rpm.
The "flying" reader heads would reach in between the disks like fingers and read the data. Occasionally the reader heads would touch the disks (for various reasons) and would "crash". It would scrap off the magnetic media and wipe out the data, often trashing the entire disk ($$$). You didn't want to be around when that happened.
Nice score on that cabinet btw and holy cow I feel old, Lol.