The D3142 is a nice drive, I've got three of them. The one in the video has it's factory 3.5" white faceplate, I have one in a factory 5.25" bracket with the black faceplate, and one with no faceplate. The NEC drives seem to be by far my most popular videos at the moment.
All of the tests are stored on floppy disks - I'm booting DOS 6.2 on A: with most of my utilities. SpeedSys, Coretest and the batch script which runs all the tests are on B:. Something is electrically wrong with that drive as sometimes it will not register that a disk is inserted for several seconds after you insert it.
There's definitely a few videos there at least on my collection, some of them are more interesting than others, I would think. I'm not sure anyone really seeks out Seagate ST-225 videos, but some of these drives I would definitely consider unusual - Panasonic JU-128, Epson-Seiko HD-860, the Hitachi DK505-2. Stuff like that.