Why Backup DBR:
The DBR contains some important information about the disk geometry. This information is located in the first sector of every partition, such as:
- Jump Code + NOP
- OEM Name and Version
- Bytes Per Sector
- Sectors Per Cluster
- Reserved Sectors
- Number of Copies of FAT
- Maximum Root Directory Entries (but Not Available for FAT32)
- Number of Sectors in Partition Smaller than 32MB (Therefore Not Available for FAT32)
- Media Descriptor (F8H for Hard Disks)
- Sectors Per FAT (In Older FAT Systems and Not Available for FAT32)
- Sectors Per Track
- Number of Heads
- Number of Hidden Sectors in Partition
- Number of Sectors in Partition
- Number of Sectors Per FAT
- FAT Information Descriptor Flags
- Version of FAT32 Drive
- Cluster Number of the Start of the Root Directory
- Sector Number of the File System Information Sector
- Sector Number of the Backup Boot Sector
- Reserved
- Logical Drive Number of Partition
- Extended Signature (29H)
- Serial Number of Partition
- Volume Name of Partition
- FAT Name
- Executable Code
- Executable Marker or Magic Number (AAH 55H
Generally, the following error messages are displayed on the screen:
“Disk boot failure”
“Non system disk or disk error”
“Invalid system disk or Disk I/O error”
“Replace the disk, and then press any key…”
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