i'm pretty sure it's standard as kakaze has said. i've read a number of upgrade articles on the web of ppl doing ibook HD replacements w/ no mention of any variation from a standard 2.5" HD. the upgrade articles which show pictures of the drives show it as a 2.5", the 1.8" ones look as if the ide connector is on the side of the drive (see link below). the ibook comes w/ a 30GB drive, while 1.8" drives are in flavors of 20 and 40 currently. from the apple store online u can upgrade to 60 or 80GB drives, the 1.8" versions at this capacity are yet to be seen in the wild, but the 60 should be around the corner.
u might be getting your i-gear mixed up, the ipod uses a 1.8" drive, which is still pretty limited in it's availability relatively speaking.
u can get a 40GB 4200rpm 1.8" drive for ~$130 http://www.zipzoomfly.com/jsp/Produc...uctCode=100527
not bad, 'cept when u compare to regular 2.5" drives, where u can get a 4200rpm 40GB drive for ~$70
http://www.bestbargainpc.com/hi4042.html
other vendors actually have the 5400rpm models for the same prices.
so yeh, it'd be quite irregular to see a premium priced technology like the 1.8" drives being put in an economy focused system like the ibook. now if apple comes out w/ a sub-compact in '05 i wouldn't be surprised to see it, but right now they don't have a laptop product which suits the technology.
have i made my point?

btw, i just bought a new ibook at a hell of a deal w/ some sweet upgrades on the way!
u might be getting your i-gear mixed up, the ipod uses a 1.8" drive, which is still pretty limited in it's availability relatively speaking.
u can get a 40GB 4200rpm 1.8" drive for ~$130 http://www.zipzoomfly.com/jsp/Produc...uctCode=100527
not bad, 'cept when u compare to regular 2.5" drives, where u can get a 4200rpm 40GB drive for ~$70
http://www.bestbargainpc.com/hi4042.html
other vendors actually have the 5400rpm models for the same prices.
so yeh, it'd be quite irregular to see a premium priced technology like the 1.8" drives being put in an economy focused system like the ibook. now if apple comes out w/ a sub-compact in '05 i wouldn't be surprised to see it, but right now they don't have a laptop product which suits the technology.
have i made my point?

btw, i just bought a new ibook at a hell of a deal w/ some sweet upgrades on the way!







), but u should b fine w/ the slower drive for most of what u want to do.
enjoy!