Apple Mac OS 7.6 - Manual (Page 10)

Step 3: Choose a disk for installation
Click the third button to select the disk on which you want to install
Mac OS 7.6.
In the dialog box that appears, choose the disk on which you’re going to
install Mac OS 7.6. Then click Select.
You see a message if you don’t have 70 MB (the amount necessary for the
standard installation) of available space on the disk you choose. Depending
on the installation options you select, you may need up to 120 MB. If there
isn’t enough space available, you need to remove files from the disk before
installing the software.
10 Chapter 1
Choose the destination
disk from this pop-up
menu.
Click here.