Dell P72G Owner's Manual page 66

Option Description
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SATA Operation Allows you to configure the internal SATA hard-drive controller. The options are:
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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 Thunderbolt 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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66 System setup options
COM4
Disabled
AHCI
RAID On: This option is enabled by default.
SATA-0
SATA-2
SATA-4
M.2 PCI-e SSD-0
Enable SMART Reporting
Enable USB Boot Support: This option is enabled by default.
Enable External USB Port: This option is enabled by default.
NOTE: USB keyboard and mouse always work in the BIOS setup irrespective of these settings.
Enable USB Boot Support: This option is enabled by default.
Enable External USB Port: This option is enabled by default.
Enable Thunderbolt Port: This option is enabled by default.
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