Off the top of my mind, stuff that I've used and still have lying around:
- 5.25" floppies (DSDD, Commodore 64; I think I may have a few HD floppies for PC but I'm not sure if I have a drive for them)
- 3.5" floppies (HD and some DD, mostly for PC; I have a few PC carcasses that have floppy drives, but I do also have a working USB floppy drive)
- Cassette tapes (Spectravideo, Commodore VIC-20, Commodore 64)
- ROM cartridges (same as above, plus game consoles)
- Iomega Zip (not sure if the Zip floppies I have have anything relevant; the USB Zip drive is in box somewhere)
- Iomega Jaz (two disks; not sure if the drive I was actually working last time I used it, could be completely hosed by now, Iomega didn't exactly have a good reputation)
- A few IDE/PATA hard drives (not sure of the condition)
- Bunch of CD/DVD/rewritables, I think I have a few unused CD-Rs/DVD-Rs too, never had a Blu-Ray drive for computers
- USB sticks and hard drives of various descriptions
- microSD cards used with Raspberry Pi
Funny thing is, I think I have no extra SATA hard drives and modern SSDs lying around, because most of the computers I have that use them are still in operation.
Well elements are elements. All of them are just protons and neutrons and electrons at the end of the day. They have different properties but all of them behave by the same rules.
But there's some big differences between the various kinds of bodies orbiting the Sun and how they're orbiting the Sun. Big asteroids were considered planets, until we discovered there's a shitload of them and they're all in roughly the same area. When it turned out Pluto is basically in the same situation and there's a lot more of the transneptunian objects, it was pretty clear that Pluto isn't special. If you compare it to planets it's pretty weird. But I think it's good that they created the dwarf planet classification because that also elevated Ceres back, hell yeah.