What's more amazing is that all those install floppies were still good. Out of my nine sets of 7.1 and 7.0.1 disks, there are at least four that have one bad disk out of six/seven.

I had to use an AppleCD 300e via the SCSI port (hopefully you got that adapter) to install 8.1.

I'm not sure if it really existed, but I heard once they were trying to develop a mini-CD to put inside this series of PowerBook. Of course, minidiscs never really took off anywhere, but I seem to recall these PBs being designed for future expansion like that.