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When Secure Boot is enabled, it is initially placed in "setup" mode, which allows a public key known as the "platform key" (PK) to be written to the firmware. Once the key is written, Secure Boot enters "User" mode, where only UEFI drivers and OS boot loaders signed with the platform key can be loaded by the firmware.
An external USB recovery drive is essential in case the data on your hard disk has been compromised up to the point where the system can no longer boot from the hard drive. Reportedly the key combination to have the Lenovo Yoga 11 UEFI firmware boot an external USB drive is "Volume Up" plus the "Windows Key" directly below the screen. [8]
Later, 386-class computers started integrating the BIOS setup utility in the ROM itself, alongside the BIOS code; these computers usually boot into the BIOS setup utility if a certain key or key combination is pressed, otherwise the BIOS POST and boot process are executed. Award BIOS setup utility on a standard PC
Formerly an IBM brand, Lenovo acquired the ThinkCentre desktop brand following its purchase of IBM's Personal Computing Division (PCD) in 2005. Following its acquisition of IBM's PCD, Lenovo has released M-series desktops in multiple form factors, ranging from traditional tower, small form factor, to ultra small form factor, and all-in-ones (AIOs).
For a cold boot, for example, it may need to execute all of its functionality. If, however, the system supports power saving or quick boot methods, the BIOS may be able to circumvent the standard POST device discovery, and simply program the devices from a preloaded system device table.
The Lenovo ThinkVantage Technologies that can also run on some other platforms are System Migration Assistant to transfer a user's personal data and environment between PC systems. Rescue and Recovery to deploy updates, recover from crashes, and provide remote access if the system will not boot or function while booted. Legacy ThinkVantage software
Jessica Capshaw and Camilla Luddington talk about their new podcast and reflect on their time on Grey's Anatomy. (Corbis via Getty Images) (Stephane Cardinale - Corbis via Getty Images)
BIOS interrupt calls perform hardware control or I/O functions requested by a program, return system information to the program, or do both. A key element of the purpose of BIOS calls is abstraction - the BIOS calls perform generally defined functions, and the specific details of how those functions are executed on the particular hardware of the system are encapsulated in the BIOS and hidden ...