Can I use the floppy drive from my PowerBook 3400 in my PowerBook G3 Series computer? What about the CD-ROM drive? Can I use the 12x or 20x CD-ROM drive from a PowerBook 3400 in any other PowerBook model?

We will address your questions individually.

1. Can I use the floppy drive from my PowerBook 3400 in my PowerBook G3 Series computer?
No, not in a PowerBook G3 Series computer. The floppy drive from a PowerBook 3400 will fit a PowerBook 5300, a PowerBook 190 or the original PowerBook G3 but it will not fit the PowerBook G3 Series computer.

2. Can I use the 12x CD-ROM drive from my 3400 in any other PowerBook model?
No.

3. Can I use the 20x CD-ROM drive from my 3400 in any other PowerBook model?
Yes, this module may also be used with the original PowerBook G3 computer.

In general, no expansion bay devices from the PowerBook 3400 or PowerBook G3 can be used in the PowerBook G3 Series computer. The form factor is completely different precluding any compatibility between the devices.

Note: Macintosh PowerBook G3 Series computers should not be confused with Macintosh PowerBook G3 computers. Though the names are similar, there are significant differences. For more information differentiating between the computers, read Tech Info Library article 24604: " PowerBook G3, G3 Series: Identifying Different Versions "