zxing qr code writer example c# Understanding the Startup Process in Visual C#.NET

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Understanding the Startup Process
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CHapTER 29
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common during this phase . It indicates that none of the configured bootable media types was available .
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Non-system disk or disk error Replace and press any key when ready
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If you changed the disk configuration recently, verify that all cables are properly connected and jumpers are correctly configured . If booting from the hard disk, verify that all removable media have been removed . If booting from a CD or DVD, verify that the BIOS is configured to start from the CD or DVD and that the Windows medium is present . If the disk subsystem and BIOS are configured correctly, the problem may be related to the file system . For instructions on repairing the Master Boot Record (MBR) and the boot sector, see the section titled How to Run Startup Repair later in this chapter . For detailed information about troubleshooting problems with the file system, see 16 . For more information about configuring the boot order, consult your computer s documentation . If you boot from the hard disk, the computer reads the boot code instructions located on the MBR . The MBR is the first sector of data on the startup hard disk . The MBR contains instructions (called boot code) and a table (called a partition table) that identify primary and extended partitions . The BIOS reads the MBR into memory and transfers control to the code in the MBR . The computer then searches the partition table for the active partition, also known as a bootable partition. The first sector of the active partition contains boot code that enables the computer to do the following:
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Read the contents of the file system used . Locate and start a 16-bit stub program (Bootmgr) in the root directory of the boot volume . This stub program switches the processor into 32- or 64-bit Protected mode and loads the 32- or 64-bit Windows Boot Manager, which is stored in the same Bootmgr file . After the Windows Boot Manager loads, startup is identical for both BIOS and EFI computers .
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The stub program is necessary because 32-bit and 64-bit computers first start in
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Real mode. In Real mode, the processor disables certain features to allow compatibility with software designed to run on 8-bit and 16-bit processors. The Windows Boot Manager is 32-bit or 64-bit, however, so the stub program sets up the BIOS computer to run the 32-bit or 64-bit software properly.
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CHapTER 29 Configuring Startup and Troubleshooting Startup Issues
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If an active partition does not exist or if boot sector information is missing or corrupt, a message similar to any of the following might appear:
n n n
Invalid partition table Error loading operating system Missing operating system
If an active partition is successfully located, the code in the boot sector locates and starts Windows Boot Loader (WinLoad) and the BIOS transfers execution to it .
Initial Startup phase for EFI Computers
Startup for EFI computers initially differs from startup for BIOS computers . EFI computers have a built-in boot manager that enables the computer s hardware to choose from multiple operating systems based on user input . When you install Windows 7 on an EFI computer, Windows adds a single entry to the EFI boot manager with the title Windows Boot Manager . This entry points to the \Efi\Microsoft\Boot\Bootmgfw .efi 32-bit or 64-bit EFI executable program the Windows Boot Manager . This is the same Windows Boot Manager that is eventually loaded on BIOS-based computers . Windows configures the EFI boot manager to display the EFI startup menu for only 2 seconds and then load the Windows Boot Manager by default to minimize complexity and startup time . If you install a different operating system or manually change the EFI boot manager settings, EFI might no longer load the Windows Boot Manager . To resolve this problem, use the Startup Repair tool, as described in the section titled The Process of Troubleshooting Startup later in this chapter . Alternatively, you might be able to update the EFI boot manager settings manually using your computer s built-in EFI tools . For more information about configuring EFI, consult your computer s documentation .
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