Acer Aspire S3-391 Service Manual page 48

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. External USB bootable device
3. Network boot
4. External USB hard drive
5. External USB optical drive
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