Apple Macintosh PowerBook 1400 - Manual (Page 125)

3 When you’ve finished updating the drivers on all your disks, close the window to quit the
Drive Setup program.
Step 3: Choose a disk for installation
Click the third button to select the disk on which you want to install the
Mac OS.
In the dialog box that appears, choose the disk on which you’re going to
install the software. Then click Select.
125 Diagnostic Techniques
Click here.
Choose the destination
disk from this pop-up
menu.