Does the original hard drive still work? It's possible that the problem is not with the drives, but with the ATA circuitry on the motherboard. If that's the case, you'll pretty much need to get a new motherboard, or only use the Duo with an external drive or with a Duo Dock that has a hard drive. On Mar 24, 2010, at 3:00 PM, duolist- request at listserver.themacintoshguy.com wrote: > > Date: Wed, 24 Mar 2010 09:43:28 -0600 > From: Keegan van der Laag <kvanderlaag at gmail.com> > Subject: [DuoList] 2300c Hard Drive Woes > > I'm now two hard drives into trying to replace the hard drive in my > Duo > 2300c, and I'm just not having any luck. From what I gather, the IDE > controller in the 2300c supports ATA...2? As in the first EIDE > specification? I was under the impression that ATA standards were > supposed to be backwards compatible, but I can see this is not the > case > - I have a 2GB drive (Fujitsu) and a 6GB Drive (IBM Apple OEM) that > both > will not detect in the 2300c. (Both drives have been HFS formatted > successfully, and read/write properly.) I've heard tell of people > managing to put some pretty hefty hard drives in their Duos - my > question is not so much how, I guess, as 'which ones'?