Dbr boot

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Back-up of DBR (DOS Boot Record) and its use

After the partition table, the DOS Boot Record (DBR) or periodically referred to as DOS Boot Sector is the second a lot of essential indevelopment on your difficult drive.

For a Detailed study around DBR, refer the chapter, “Logical Approach to Disks and also OS”, Discussed previously in this book.

First logical sector of each DOS partition will contain a DOS Boot Record (DBR) or DOS Boot Sector. The project of the DBR is to load the operating system from the tough disk drive right into the main memory of computer system and also provide the system’s regulate to the loaded regime.

The DOS Boot Record (DBR) for the first partition on a tough disk is commonly found at Absolute Sector 63 (the 64th sector on the disk drive) or in CHS develop we deserve to say C–H–S = 0–1–1 for most drives.

However before this location may vary depending on the SPT (Sectors per Track) of the Drive. For instance, on an old 245MB drive having just 31 SPT, the Boot Record was located on the 3second sector (Absolute Sector 31).


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The DBR is produced by the FORMAT command of DOS, after partitioning is done utilizing the FDISK command also. The sector on which DBR stays becomes logical sector 1 of that specific partition for the DOS. The sector number offered by DOS starts from the physical sector on which DBR is located.

The DBR contains a tiny routine which is executed by the Master Boot Record (MBR) Executable regime. All DOS partitions contain the routine code to boot the machine i.e. pack the operating system, yet just that partition is given control by the Master Boot Record which as mentioned as energetic partition, in the partition table enattempt.

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BPB Publications, New Delhi, India 540 81-7656-922-4 $69.00 (Including Shipping Charges, Cost of Publication and Other costs, Free Source Code CD consisted of with the Book)

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