Ok... I will have to research that, later, but:

My current Fujitsu lifebook has tray which can be used for "additional battery" or CD/DVD drive (read-and-write). Or left empty, with plastic anti-dust cover, if you want to make it light-not-heavy.

And I think (not sure) that newer "extensions", such as Blu-ray, would fit same tray, too.

Though, I am not sure how standard-compatible they are, but they seem to be of the same shape, and with SATA interface.

And, there are Hard-drive-holders, which allow a hard drive to be plugged into this tray, and avoid the hassle of external-clumsy USB thingies.

And if anybody can recommend me a compatible floppy-disk-drive... That would be amazing.

If anybody has the knowledge to explain why the tray does not work like "The-Other-Half" for Lifebook, he-or-she (or it, if an AI robot happens to read it ;-) ) is welcome. Or I will be greatly tempted to clean up dust from the Lifebook, and then equip it with the tray-thingies.

[One problem is: how do I debug the tray-thingies? Because currently, CD/DVD drive does not work, and I haven't ever tested the battery.]

Thank you. Best wishes.