Hi pastorjoseph,
Welcome to Vista Forums!
I'm sorry, but I don't understand the situation. What kind of external drive is the 3.5 drive - is it an external hard drive or an external 1.4mb diskette drive? What really has me confused is your saying "back to the same 3.5 external drive." If the former, then you need something to read the 1.4mb disks (on the PC or a separate drive) and if the PC sees both drives then I see no reason you can't transfer from the 1.4mb disks to the external drive. If the latter, then AFAIK the device has no separate memory and there's nowhere on it to tranfer any data to (except to a 1.4mb disk) - but then it really isn't on the drive but rather is on the disk.
Could you please clarify the situation and then I will do my best to try to answer your question. Have you already tried this and it doesn't work (and, if so, what's the problem and/or error message)? If an external disk drive, is it not showing up on the PC when you attach it or does it appear but when you insert a disk, the contents don't appear?
I'm sorry if I'm just not getting it, but if you could explain further then perhaps I will understand the question or the problem and be able to help you. At this point, I am mostly confused about what you are trying to do using what equipment and what problems you are having doing it. What is the objective you are trying to accomplish (beyond what you stated) - I mean what exactly are you trying to do here?
Thanks and good luck!