Acer TravelMate P643-V Service Manual page 62

Boot
Use this tab to set the preferred drive sequence in which the Setup Utility attempts to boot the
operating system. By default, the computer searches for boot devices in the following order:
1. Hard disk drive
2. Optical disc drive
3. Network boot
4. External USB hard drive
5. External USB optical drive
6. External USB bootable device
Press to select a device and press F5 or F6 to move it up or down the list.
Figure 2-8. BIOS Boot
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System Utilities