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Topic: Master boot record

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	Master boot record - Wikipedia, the free encyclopedia
		In the IBM PC architecture the Master Boot Record (MBR), or partition sector, is the 512-byte boot sector, i.e.
		The MBR of a drive usually includes the drive's partition table, which the PC uses to load and run the boot record of the partition that is marked with the active flag.
		Because the i386 family of processors boot up in real mode, the sequence of machine language commands in the master boot record will be executed in real mode, even when the operating system to be loaded will spend most of its time in protected mode.
	en.wikipedia.org /wiki/Master_boot_record (363 words)

	The Master Boot Record (MBR) and What it Does
		The master boot record is always located at cylinder 0, head 0, and sector 1, the first sector on the disk.
		If a Master Boot Record is found, it is read into memory at location 0000:7c00 and INT 19 jumps to memory location 0000:7c00 the same as was the case with the floppy.
		The boot record program uses this data to determine the drive being booted from and the exact location of the partition on the disk.
	www.dewassoc.com /kbase/hard_drives/master_boot_record.htm (2649 words)

	HIW: Master Boot Record
		The MBR is the sector at cylinder 0, head 0, sector 1 of a hard disk.
		If an active partition is found, that partition's boot record is read into 0000:7c00 and the MBR code jumps to 0000:7c00 with SI pointing to the partition table entry that describes the partition being booted.
		The boot record program uses this data to determine the drive being booted from and the location of the partition on the disk.
	www.ata-atapi.com /hiwmbr.htm (684 words)

	MBR - Master Boot Record
		Master Boot Record An area of the outermost cylinder of a PC hard disk which contains the partition table.
		MBR viruses normally enter a system through a floppy disk that is installed in the floppy drive when the computer is started up.
		When booting from the hard drive, the BIOS or a special Firmware loads the contents of the MBR to a fixed address in the memory and allows it to take control.
	www.auditmypc.com /acronym/MBR.asp (638 words)

	Master Boot Record - MBR (Site not responding. Last check: 2007-11-06)
		Short for Master Boot Record, MBR is also sometimes referred to as the "master boot block" and is the first sector of the computer hard disk drive used to determine from which partition a computer will boot.
		The master boot record is located on the first sector of the hard drive; it's the first program the computer runs after performing a memory check and looking for a bootable disk (if set in CMOS).
		The MBR is also susceptible to boot sector viruses that can corrupt or delete the MBR, which can leave the hard drive unusable and prevent the computer from booting up.
	www.computerhope.com /jargon/m/mbr.htm (174 words)

	BBPC News \| BuildOrBuy - MBR, Master Boot Record
		PowerQuest: "The master boot record is contained in the first sector of the first physical hard disk.
		The MBR consists of a master boot program and a partition table that describes the disk partitions.
		The MBR is contained in the Sector located at cylinder 0, head 0, sector 1 of the hard disk, and is created by a Disk Utility such as the DOS FDISK utility.
	www.buildorbuy.org /mbr.html (523 words)

	Master Boot Record (MBR)
		The master boot record is always located at cylinder 0, head 0, and sector 1, the first sector on the disk (see here for more on these disk geometry terms).
		One of the partitions is marked as active, indicating that it is the one that the computer should use for booting up.
		Since the master boot code is the first program executed when you turn on your PC, this is a favorite place for virus writers to target.
	www.pcguide.com /ref/hdd/file/structMBR-c.html (406 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		The hard disk is inaccesible after a diskette boot, since the operating system cannot find valid partition data in the Master Boot Record - attempts to use the hard disk result in the DOS error message "Invalid drive specification".
		The changes to the Master Boot Record cannot be detected while the virus is active, since it rerouts the BIOS-level disk calls through its own code.
		Using this table, the virus is able to move a diskette's original boot record and a part of its own code to a safe area on the diskette.
	ciac.llnl.gov /ciac/virdb/VIRS0614.TXT (692 words)

	Xavier's programming pages - Master Boot Record (Site not responding. Last check: 2007-11-06)
		The master boot record is the sector where all the partition information is stored.
		This implies that, if the hard disk is the first one, the first bytes of the master boot record have to be instructions.
		Here we have an extended partition (05h), meaning that the first sector of this partition is a master boot record itself.
	www.yates2k.net /master.htm (3788 words)

	Clearing the Master Boot Record
		It goes far beyond fdisk /mbr in clearing the master boot record.
		There is a virus on the master boot record of the hard drive (in this case a DOS format will not remove the virus).
		A cold boot is necessary this is done to clear the virus from memory and prevent it from writing to the disk.
	www.softcom.net /users/fdamico/clear_mbr.htm (261 words)

	Define Master Boot Record - a Whatis.com definition - see also: MBR (Site not responding. Last check: 2007-11-06)
		The Master Boot Record (MBR) is the information in the first sector of any hard disk or diskette that identifies how and where an operating system is located so that it can be boot (loaded) into the computer's main storage or random access memory.
		The Master Boot Record is also sometimes called the "partition sector" or the "master partition table" because it includes a table that locates each partition that the hard disk has been formatted into.
		In addition to this table, the MBR also includes a program that reads the boot sector record of the partition containing the operating system to be booted into RAM.
	searchsmb.techtarget.com /sDefinition/0,,sid44_gci214086,00.html (208 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		This sector is the so-called Master Boot Record (MBR).
		The small program in the MBR examines the partitions and loads the first sector of the partition which has the 'active' flag.
		This first sector of a partition is called the boot sector.
	www.masterbooter.com /support/technikalinfo_en.html (238 words)

	master boot record (Site not responding. Last check: 2007-11-06)
		In the IBM PC architecture the master boot record (MBR), or partition sector, is the 512-byte (½ kilobyte) boot sector, i.e.
		The sequence of assembly language commands in the master boot record operates in real mode, even when the operating system to be loaded works (most of the time) in protected mode
		In the boot process, it differs whether from partitioned media or not.
	www.silvertrail.yk.ca /master-boot-record.html (251 words)

	DriverHeaven.net - Master boot record moving...help...
		Cause if my 40 ever died out, I wouldn't be able to boot, cause it doesn't have the boot record on the 200gb.
		The boot partition can, but is not required, to be the same partition as the system partition.
		All it's doing is going for the boot record on the 40GB, then contiues to boot off the 200GB (Where Windows is installed.) But I can't let it PURELY boot off the 200GB, it needs to read the 40GB first.
	www.driverheaven.net /showthread.php?t=57433 (1333 words)

	Réparer le MBR "Master Boot Record" (Site not responding. Last check: 2007-11-06)
		Master boot record is the first sector of the disk that is accessed by you computer BIOS as soon as it boots up.
		It means that your ability to boot to a particular operating system depends upon the correctness of Master Boot Record.
		Assume if you are not able to boot due to your dislike of the changes in boot loader process or corruption in MBR (btw, this could happen for a variety of reasons, right from virus to your own experiments with multi boot process..
	pages.infinit.net /lpaquin/astuces/ast052xp.htm (302 words)

	master boot record format
		The Master Boot Record has the limit of four entries in the M aster Partition Table.
		However the location of Extended Master Boot Record can be obtained with the help of Master Boot Record that contains Extended Partition Tables, whose format is exactly the same as of the main Partition Table except there is no boot code.
		In extended Master Boot Record, this space of 446 Bytes is normally reserved for the boot code and remains empty.
	www.datadoctor.biz /Data_Recovery_Programming_Book_Chapter3-Page7.html (300 words)

	Master Boot Record
		If the boot drive is a hard disk, this sector will be a Master Boot Record.
		There are a great many different examples of MBR code, depending on the operating system and version that install the MBR.
		All MBRs, however, have a similar structure: a small bootstrap program at the beginning (though the bootstrap code my spill off onto additional disk sectors) followed by a "partition table," which consists of four 16 byte partition records.
	bootmaster.filerecovery.biz /appnote4.html (1461 words)

	Master Boot Record Save and Restore--Application" (Site not responding. Last check: 2007-11-06)
		Then boot to the boot floppy and type "getmbr dos.mbr" (or whatever filename you choose for the initial partition configuration).
		Boot to the boot floppy and type "getmbr lilo.mbr".
		The MBR files you save are snapshots of the disk as it existed at the time you saved the MBRs.
	www.allthatcounts.com /comp/mbr1.htm (362 words)

	Repairing The Master Boot Record
		Most, but not all, viruses that infect the MBR do so by copying the contents of the boot sector to a different file and then overwriting the boot sector with viral code.
		When you remove a boot sector virus, the anti virus program is usually smart enough to know where the original boot sector was copied to.
		This means that whether your MBR is malfunctioning because of a virus or because of a boot program gone haywire, the repair method is exactly the same.
	www.brienposey.com /kb/repairing_the_mbr.asp (602 words)

	Rewrite Master Boot Record (Site not responding. Last check: 2007-11-06)
		Prior to boot sector viruses, it was rare that any support person even knew what a MBR was.
		If your MBR has been contaminated by a virus, use the virus vendors document to recover it.
		Replacing the MBR may the worst thing you can do given certain viruses that twiddle with disk sectors - hidding or encrypting data.
	www.windowsnetworking.com /kbase/WindowsTips/WindowsNT/AdminTips/Miscellaneous/RewriteMasterBootRecord.html (395 words)

	PCApex Forums - Master Boot Record Questions!
		Once the next boot screen comes up, every line on the screen is covered with a - or a = making it hard to read the text behind it.
		I thought fdisk mbr had a menu where you can choose to restore the boot record or delete it.
		If you FDisk'd the MBR, FDisk'd the Hard Drive (delete the old partition and created a new one) and formatted it, the virus should be gone unless it resides inside the Bios.
	forums.pimprig.com /anything_goes/9633-master_boot_record_questions-print.html (1178 words)

	gibbsie.org - How to uninstall a bootloader from the MBR (Master Boot Record) of the hard disk (Site not responding. Last check: 2007-11-06)
		Some bootloaders are of more use than others, some infact being known as boot managers instead due to their flexibility in what they can boot.
		Boot from the Windows XP CD and press the "R" key during the setup in order to start the Recovery Console.
		Boot from the Windows 2000 CD and press the "R" key during the setup and the "K" key in the following menu in order to start the Recovery Console.
	www.gibbsie.org /modules.php?name=News&file=article&sid=323 (607 words)

	The Master Boot Record - The Scream!
		If the Master Boot Record is corrupted you will not be able to see the content of your hard drive but it is still there.
		It did not format the drive but merely took a copy of the MBR from the master drive and copied it (with modifications?) to the slave drive.
		Am I correct in thinking of visible and invisible data as rather like an old fashioned stereo record where both channels are in the one groove and where playing (or recording) equipment can involve both channels or just the right channel or just the left channel.
	www.the-scream.co.uk /forums/showthread.php?t=5124 (1291 words)

	[No title]
		The Master Boot Record is located at the beginning of your primary fixed disk.
		The master boot code is a short program that determines which operating system will start the computer, then transfers control to that operating system.
		Some operating systems replace the master boot code with their own program, which may not allow MS-DOS to start the system, even if the partitions are valid DOS partitions.
	chanae.walon.org /pub/DOS/muf16.txt (7195 words)

	Fix master boot record
		The MBR is an acronym for Master Boot Record.
		Usually, the MBR is on the first sector (or chunk of storage space) of a hard drive.
		Then it passes off control to the boot area on the primary partition (usually the C: drive) and promptly goes back to sleep.
	www.cyberwalker.net /columns/sep98/090398.html (380 words)

	Bootmanager BootStar Manual - Master Boot Record (Site not responding. Last check: 2007-11-06)
		The master boot record is the first sector on the harddisk.
		It contains the "bootstrap." This is a program, which is called by the BIOS to load the actual operating system.
		The format of this master boot record (bootstrap / partition table) is permanently defined and is absolutely required by all operating systems.
	www.star-tools.com /bootstar/english/manual/bmbr.html (122 words)

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