Look at the BLUE sticker on the drive motor (bottom of drive) 
 
If it says MP-F75W-01G, you have an 800KB mechanism 
 
If it says MP-F75W-11G, you have a Superdrive (1.44MB) mechanism. 
 
I've gotten the Superdrive mechanisms off of ebay for $2 each. 
 
Alastair Boyanich <boyanich@murdoch.edu.au> wrote in message news:<3CE225A2.8D840745@murdoch.edu.au>... 
> Wayne Stewart wrote: 
> >  
> > Alastair Boyanich wrote: 
> > > 
> > > Hellfire wrote: 
> > > > 
> > > > I found that if you disassemble the casing, you can put a superdrive in 
> > > > place of the original drive. Works great! 
> > > > 
> > > >     -Matt 
> > > > 
> > > 
> > > Hellfire: 
> > > 
> > > I've tried this..already. Just the Apple won't accept it. Hmm. Did you modify 
> > > the drive at all for the insert notifyer? 
> >  
> > Were that drive an auto-inject drive? I've got about a dozen drives with 
> > 1.4mg 
> > auto-inject mechanisms and they work fine. On one side and the bottom 
> > should be 
> > the numbers MP-F75W . 
> >  
> >         Wayne 
>  
> MFD-75W-01G  ..doesn't look like it. :(