HD Doctor Blog

Sometimes, the master boot record(MBR) on a hard disk may become corrupted as a result of installing other operating systems or through infection by a boot-block virus. When this happens, you can boot from a floppy (you must have the necessary files) and attempt to re-write the Master Boot Record (Microsoft Windows 95/98/Me/2000/XP only) by typing "FDISK /MBR" (leave out the quotes). If that doesn’t work, there are other ways to purge the MBR through the use of debug routines, SCSI low-level format routines, or the zero-fill utility in your SCSI controller BIOS. Consult your operating system vendor for…

External USB, eSATA, Firewire, and internal hard drives over 2 TB’s cannot be formatted on Windows 32-bit operating systems using the Master Boot Record (MBR) partitioning scheme. As a result, when you connect drives over 2 TB’s, depending on which interface you are using to connect them to the computer, they may not be recognized at all, they may be only partially recognized, or they may be recognized but you can’t access them. Other issues such as the system locking up or the computer not being able to boot may also occur.

Cause:
This not an external…

What is the MBR?

A master boot record (MBR), or partition sector, is the 512-byte boot sector that is the first sector ("LBA Sector 0") of a partitioned data storage device such as a hard disk. (The boot sector of a non-partitioned device is a Volume Boot Record. These are usually different, although it is possible to create a record that acts as both; it is called a multi boot record.) The MBR may be used for one or more of the following:

• Holding a disk’s primary partition table
• Bootstrapping operating systems, after the computer’s

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