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On system with BIOS firmware, the BIOS invokes MBR boot code from a hard disk drive at startup. The MBR boot code and the VBR boot code are OS-specific. In Microsoft Windows, the MBR boot code tries to find an active partition (the MBR is only 512 bytes), then executes the VBR boot code of an active partition.
The MBR code of OS/2, MS-DOS (prior to 7.0), PC DOS (up to 7.10), and Windows NT (up to ca. 2007) happens to provide this same interface as well, although these systems do not make use of it. The MBR installed by Windows NT 6.0 (and higher) uses other registers, and is therefore no longer compatible with these extensions.
The MBR sector may contain code to locate the active partition and invoke its volume boot record. A volume boot record (VBR) is the first sector of a data storage device that has not been partitioned, or the first sector of an individual partition on a data storage device that has been partitioned.
A MBR program may interact with the user to determine which partition on which drive should boot, and may transfer control to the MBR of a different drive. Other MBR code contains a list of disk locations (often corresponding to the contents of files in a filesystem) of the remainder of the boot manager code to load and to execute. (The first ...
Windows Vista: 2006-07-22 IA-32 Yes No MBR takes precedence in hybrid configuration. Windows Server 2008: 2008-02-27 IA-32 Yes No MBR takes precedence in hybrid configuration. Windows 7: 2009-10-22 IA-32 Yes No MBR takes precedence in hybrid configuration. Windows 8: 2012-08-01 IA-32 Yes Requires UEFI [32] MBR takes precedence in hybrid ...
To sum it up, while the MBR entries could be massaged to describe partitions up to 4 TB (with 512 bytes per sector), for this to work, the code, which interprets the MBR entries, needs to take more than 32 bits into account as well -- and most existing code dealing with MBR partitions in one way or another does not, simply because, officially ...
Despite active quake year, some California suburbs refuse to fix vulnerable buildings. Rong-Gong Lin II. November 23, 2024 at 6:00 AM.
In that system, when one (and only one) partition record entry in the master boot record (MBR) is designated an extended partition, then that partition can be subdivided into a number of logical partitions. The actual structure of that extended partition is described by one or more EBRs, which are located inside the extended partition.