Ok, I played some more with it and it seems my assumption was correct about the data chunks and that it auto-prompts for the next disk if the next expected chunk is not in the same directory as the installer. However, the dialogs it displays a very generic and display something like insert the disk labeled #1 ... my next question is, is it possible to customise that message? Ideally I would like to be able to initially prompt for disc 1, then disc 2 ... disc x where the disc's have custom labels.

Thanks.