When you start the process of Windows 7 installation, unused storage
drivers disabled. This behavior helps you to speed up the startup
process of the operating system. When you change the startup disk for a
driver that was disabled, you must enable the new driver before you
change the hardware configuration.
AHCI (Advanced Host Controller Interface Serial ATA) has several features of SATA devices. These include hot-plug and power-saving features. The issues occur during the installation of earlier versions of the Windows operating system are compatible with the new Windows 7 startup method. Windows 7 uses a new Boot Configuration Database (BCD). This archive contains a boot menu and all the data on the operating systems installed on your computer. Therefore, the Boot.ini file in earlier version of the Windows operating system will not be used to launch Windows 7. If a previous version of the Windows operating system is installed in a dual boot with Windows Vista or Windows 7, Windows will launch the program director for NTLDR transfer management of the previous version of the Windows operating system.
If you have any problems in starting your computer with Windows 7, it is often useful to repair the MBR (Master Boot Record) to restore the boot loader for Windows 7 and you can do it easily from the Windows installation disc. This is generally most useful if you broke something, and there is a boot loader error, or if you have made the mistake of installing an earlier version of Windows on the same PC that already have Windows 7, which erases boot loader. If your PC starts boot into Windows, but failed, you should probably try to use Safe Mode instead.
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