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The Lenovo IdeaPad Yoga 11 is a hybrid laptop/tablet Windows RT-based computer released in late 2012. The Yoga 11 gets its name from its ability to change form factors thanks to the two-way hinge used to mount its display. It was discontinued on July 17, 2013, due to the poor sales of Windows RT devices. [1]
With UEFI, it is possible to store product keys for operating systems such as Windows, on the UEFI firmware of the device. [21] [22] [23] UEFI is required for Secure Boot on devices shipping with Windows 8 [24] [25] and above. It is also possible for operating systems to access UEFI configuration data. [26]
If the sector is read successfully, some BIOSes will also check for the boot sector signature 0x55 0xAA in the last two bytes of the sector (which is 512 bytes long), before accepting a boot sector and considering the device bootable. [b] When a bootable device is found, the BIOS transfers control to the loaded sector.
The keyboard itself was an intelligent device and had its own processor and 4 kilobytes of RAM for keeping a buffer of the sequence of keys that were being pressed, thus can communicate with the user if a fault is found by flashing its main LED in sequence:
No drivers are required, but the system functionality is limited until the operating system kernel and drivers are transferred and started. As a result, once the ROM-based booting has completed it is entirely possible to network boot into an operating system that itself does not have the ability to use the network interface.
A bootable MBR device is defined as one that can be read from, and where the last two bytes of the first sector contain the little-endian word AA55h, [nb 6] found as byte sequence 55h, AAh on disk (also known as the MBR boot signature), or where it is otherwise established that the code inside the sector is executable on x86 PCs.
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A modern PC is configured to attempt to boot from various devices in a certain order. If a computer is not booting from the device desired, such as the floppy drive, the user may have to enter the BIOS Setup function by pressing a special key when the computer is first turned on (such as Delete, F1, F2, F10 or F12), and then changing the boot order. [6]