There are presently no laptop drives larger than 160GB. You need to get a 2.5-inch ATA drive for a replacement in your iBook. Replacement drives larger than 100GB are still quite expensive. 7200 rpm drives tend to run hotter, and may not be the best choice for an iBook. If you do need a lot of storage space (the 250GB drive, for example), then buy the drive, and get an external Firewire case for it. Of course, you lose some portability, but you can have as much storage as you want that way.