Dell Vostro 15-5568 Owner's Manual page 72

Option Description
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Drives Allows you to configure the SATA drives on board. All drives are enabled by default.
The options are:
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SMART Reporting This field controls whether hard drive errors for integrated drives are reported
during system startup. This technology is part of the SMART (Self Monitoring
Analysis and Reporting Technology) specification. This option is disabled by default.
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USB Configuration This is an optional feature.
This field configures the integrated USB controller. If Boot Support is enabled, the
system is allowed to boot any type of USB Mass Storage Devices (HDD, memory
key, floppy).
If USB port is enabled, device attached to this port is enabled and available for OS.
If USB port is disabled, the OS cannot see any device attached to this port.
The options are:
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USB PowerShare This field configures the USB PowerShare feature behavior. This option allows you
to charge external devices using the stored system battery power through the USB
PowerShare port. By default, the Enable USB PowerShare is disabled.
Audio This field enables or disables the integrated audio controller. By default, the Enable
Audio option is selected. The options are:
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Keyboard This field lets you choose the operating mode of the keyboard illumination feature.
Illumination The keyboard brightness level can be set from 0% to 100%. The options are:
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AHCI
RAID On: This option is enabled by default.
SATA-1
M.2 PCI-e SSD-0
Enable SMART Reporting
Enable USB Boot Support (by default enable)
Enable External USB Port (by default enable)
Enable Thunderbolt Port (by default enable).
Enable Thunderbolt Boot Support. This is an optional feature.
Always Allows Dell Docks. This is an optional feature.
Enables Thunderbolt (and PCIe behind TBT) Pre-boot
NOTE: USB keyboard and mouse always work in the BIOS setup irrespective of
these settings.
Enable Microphone (by default enabled)
Enable Internal Speaker (by default enabled)