Apple Duo 270C manual Hard disks, Virtual memory

Hard disks

The PowerBook Duo starts up from its internal hard disk automatically. If you have an external hard disk connected to your Duo MiniDock, that disk’s icon also appears when you start up.

You may prefer to start up from the external hard disk when the PowerBook Duo is docked. If so, use system software version 7.1 or later to install a System Folder on that disk, and select it in the Startup Disk control panel. See the instructions on installing system software in the chapter on setting up your programs.

If you start up from an external hard disk, the preferences selected on that disk override those selected on your PowerBook Duo. When you use the PowerBook away from the minidock, the computer uses the preferences associated with its own hard disk.

vStartup disk surprise? If you select an external hard disk as your startup disk, your PowerBook Duo will start up from any external hard disk that has the same SCSI ID number as the one you selected. v

Virtual memory

The PowerBook Duo can borrow space on a hard disk to increase the memory available for using programs. The disk space is called virtual memory.

You can set aside virtual memory space on the hard disk belonging to the PowerBook Duo, or on a hard disk connected to the Duo MiniDock.

If you set aside virtual memory space on a hard disk connected to the minidock, virtual memory will not be available when you use the PowerBook away from the minidock. The next time you dock, virtual memory is turned back on automatically.

If you set aside virtual memory space on the PowerBook’s hard disk, virtual memory is always available.

Chapter 13: Building a PowerBook Duo System 249