wheres the drive?

Ok My brand new computer started up having five drives listed in the devices with removable storage section of "my computer" after a few days of use I now find only three drives in this section.
floppy A:
DVD/CD-RW drive D:
and DVD RAM drive E:

the other two i don't remember what they were called but i remember one was drive F:

I have a mini card and floppy reader that takes floppys in one slot, CF and MD cards in another slot, and MS, SD/mmc and SM cards a third. so I figured that the three non disk drives were for each of the three slots. but now two of the three non-disk drives are gone.
what happened?
where did they go?
and how can i get them back?

 

Usually a removeable drive will disappear from the list when you have rebooted having previously taken out the drive. Just re-insert the removeable drive and it will re-appear as the next available drive letter (F: for instance)