When a PC starts, the BIOS will load the master boot code into the PC's RAM. It also hosts the Master Boot Record (MBR), which contains the disk signature, partition table for the disk, and a small bit of code called the master boot code. The boot sector contains some code and data that helps BIOS hand off the startup process to Windows. It's created when you format the hard drive. ![]() The boot sector is a small section at the beginning of a hard drive. Then, what are the boot sector and master boot record exactly? And you will receive an error message like the following before Windows actually begins to load.įATAL: No bootable medium found! System halted. ![]() If you have Windows 7 boot problems, the boot sector or master boot record on your system partition may be damaged, corrupted, or has missing files. When need to perform Windows 7 boot repair via Command Prompt? Useful tip: backup computer to greatly reduce data losses. ![]()
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