Drew, kinda useless answer, but the 2400 will take 12.5mm thick drive or less....the question is, what did the G3 have in it. I would think the G3 would be no larger than 12.5 since that's been the standard for the past few years, until the 9.5's really started to show up. You might just give MCE a call and ask. http://store.powerbook1.com/harddrives.html I'm not sure what the deal is here(from MCE's site), except for a controller issue maybe: PowerBook G3 1998 Owners: The PowerBook G3 Series 1998 (Apple Family Number M4753) has special internal hard drive requirements. As a result of this, it is imperative that you specify whether you have this PowerBook model when you place an order for a MobileStor hard drive to ensure that you are sent the correct solution for your computer. >>Howdy, List; >> >> > >I never got the definitive answer to the question: > >Will the 4 gig hard drive from a G3 Wall Street fit in my PB 2400c? > >Are they the same size? > >Thanks Ralph Mawyer, Jr. San Antonio, Texas Associate Editor mac2400 ... http://www.sineware.com/mac2400 Your PowerBook 2400 Reference Site "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." Benjamin Franklin, 1759.