Apple Duo 270C manual Hard disks, Scsi devices, Virtual memory

Hard disks

The PowerBook Duo starts up from its internal hard disk automatically. If you have a hard disk installed in or connected to your Duo Dock, that disk’s icon also appears when you start up.

You may prefer to start up from the Duo Dock’s hard disk when the PowerBook Duo is docked. If so, use system software version

7.1or 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 in your PowerBook Duo User’s Guide.

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

vStartup disk surprise?: If you select the hard disk in the Duo Dock as your startup disk, your PowerBook Duo will also start up from the internal hard disk of any other Duo Dock you use. (This is because all Duo Dock internal hard disks have the SCSI ID number 1.) v

SCSI devices

If you have a hard disk installed in your Duo Dock, you can chain up to five additional SCSI devices to your Powerbook Duo System. If you do not have a hard disk installed in your Duo Dock, you can chain up to six devices.

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 either the PowerBook Duo or the Duo Dock.

If you set aside virtual memory space on the dock’s hard disk, virtual memory will not be available when you use the PowerBook outside the dock. 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 223