Firstly, OS X Jaguar will run fine on that iBook (OS 9 will be MUCH faster, but Jaguar is SO MUCH worth the lag time you will feel and will be plenty usable - I have installed it on a 333MHz Rev D iMac and am quite happy with the performance).
However, the person selling you the iBook mentions that even though Photoshop is installed on the the iBook, he/she doesn't have the original Photoshop install disks, which means upgrading the drive is not an option if you want to keep Photoshop.
As for 6GB HD being big enough, if you are going to install Jaguar, you will need to wipe the harddrive (goodbye Photoshop) and then you can run OS9 and OSX side-by-side on a single partition.
So in conclusion, if you are going to buy this iBook and need Photoshop, leave it alone and don't add a new HD or Jaguar, and if you don't need photoshop and don't need lots of storage space, you could easily put Jaguar on the 6GB HD although you will not have a lot of room for tons of apps/MP3 files, etc.
Just my 2 cents.
However, the person selling you the iBook mentions that even though Photoshop is installed on the the iBook, he/she doesn't have the original Photoshop install disks, which means upgrading the drive is not an option if you want to keep Photoshop.
As for 6GB HD being big enough, if you are going to install Jaguar, you will need to wipe the harddrive (goodbye Photoshop) and then you can run OS9 and OSX side-by-side on a single partition.
So in conclusion, if you are going to buy this iBook and need Photoshop, leave it alone and don't add a new HD or Jaguar, and if you don't need photoshop and don't need lots of storage space, you could easily put Jaguar on the 6GB HD although you will not have a lot of room for tons of apps/MP3 files, etc.
Just my 2 cents.