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Full Discussion: Hard Drives and MBR
Special Forums Hardware Hard Drives and MBR Post 302816863 by hicksd8 on Tuesday 4th of June 2013 05:28:02 PM
Old 06-04-2013
The MBR (Master Boot Record) resides on the first sector of the disk and is where control is passed to by the machine BIOS.

The MBR will be different from operating system to operating system, and each operating system will have a way of writing its own MBR.

For example, in Windows

Code:
 
fdisk /mbr

(google that for syntax) will write an MBR and on Solaris the

Code:
 
installboot

command will write an MBR.

If an MBR exists at all when the disk comes from the factory, that will just be from the manufacturing test process and probably won't be what you need for your O/S. When the O/S install routine runs it will install its MBR.
 

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LEARN ABOUT FREEBSD

uefi

UEFI(8) 						    BSD System Manager's Manual 						   UEFI(8)

NAME

     UEFI -- Unified Extensible Firmware Interface bootstrapping procedures

DESCRIPTION

     The UEFI Unified Extensible Firmware Interface provides boot- and run-time services to operating systems.	UEFI is a replacement for the
     legacy BIOS on the i386 and amd64 CPU architectures, and is also used on arm64 and ia64.

     The UEFI boot process loads system bootstrap code located in an EFI System Partition (ESP).  The ESP is a GPT or MBR partition with a spe-
     cific identifier that contains an msdosfs(5) FAT file system with a specified file hierarchy.

	   Partition Scheme    ESP Identifier
	   GPT		       C12A7328-F81F-11D2-BA4B-00A0C93EC93B
	   MBR		       0xEF

     The UEFI boot process proceeds as follows:
	   1.	UEFI firmware runs at power up and searches for an OS loader in the EFI system partition.  The path to the loader may be set by an
		EFI environment variable.  If not set, the default is /EFI/BOOT/BOOTX64.EFI.  The default UEFI boot configuration for FreeBSD
		installs boot1.efi as /EFI/BOOT/BOOTX64.EFI.
	   2.	boot1.efi locates the first partition with the type freebsd-ufs, and from it loads loader.efi.
	   3.	loader.efi loads and boots the kernel, as described in loader(8).

     The vt(4) system console is automatically selected when booting via UEFI.

FILES

     /boot/boot1.efi
		   First stage UEFI bootstrap
     /boot/boot1.efifat
		   msdosfs(5) FAT file system image containing boot1.efi for use by bsdinstall(8) and the bootcode argument to gpart(8).
     /boot/loader.efi
		   Final stage bootstrap
     /boot/kernel/kernel
		   default kernel
     /boot/kernel.old/kernel
		   typical non-default kernel (optional)

SEE ALSO

     vt(4), msdosfs(5), boot(8), gpart(8)

HISTORY

     UEFI boot support first appeared in FreeBSD 10.1.

AUTHORS

     UEFI boot support was developed by Benno Rice <benno@FreeBSD.org>, Ed Maste <emaste@FreeBSD.org>, and Nathan Whitehorn
     <nwhitehorn@FreeBSD.org>.	The FreeBSD Foundation sponsored portions of the work.

CAVEATS

     EFI environment variables are not supported by loader(8) or the kernel.

     boot1.efi loads loader.efi from the first FreeBSD-UFS file system it locates, even if it is on a different disk.

     boot1.efi cannot load loader.efi from a ZFS(8) file system.  As a result, UEFI does not support a typical root file system on ZFS configura-
     tion.

BSD
								 October 17, 2014							       BSD
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