As long as the first partition on the disk is less than 4GB, SCSI Disk Mode will work on the pre-G3 PowerBooks with high-capacity hard drives. Of course, only that first partition will be usable in disk mode; the rest will be invisible until the machine is rebooted.
Unless you want to go with an IDE-CF adapter or something, generic 2.5" IDE is all you're gonna get: you can't use SCSI or SATA or anything else.
If it were me, I wouldn't go more than 60GB @ 4200RPM on a 1400, as the performance improvement would be fairly minimal (since the 1400's IDE controller, along with the rest of the system, is pretty slow).
On the Pismo, though, I may go for an 80 to 120GB @ 5400RPM, since it can run OS 9 and X and a few decent games, and its disk controller can do UDMA.
Unless you want to go with an IDE-CF adapter or something, generic 2.5" IDE is all you're gonna get: you can't use SCSI or SATA or anything else.
If it were me, I wouldn't go more than 60GB @ 4200RPM on a 1400, as the performance improvement would be fairly minimal (since the 1400's IDE controller, along with the rest of the system, is pretty slow).
On the Pismo, though, I may go for an 80 to 120GB @ 5400RPM, since it can run OS 9 and X and a few decent games, and its disk controller can do UDMA.