Flash Extractor
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Boot


Boot sector is located at first sector of partition. At the end of the boot sector is a 2-byte structure 55 AA also.

Boot sector can contain marks about using file system FAT, FAT16 or FAT32. But these marks are not so required.

To find boot sector using Hex Editor put FAT?? at search line.

General parameters for FAT boot:

The main fields for FAT 16 boot sector



The main fields for FAT 32 boot sector



Sector
Bytes per sector. (512, 1024, 2048 or 4096)
Generally 0x200 = 512

Cluster
Sectors per cluster

Reserved
Reserved sector count. The number of sectors before the first FAT.

N
Number of file allocation tables.
Almost always 2 for flash.

Root Size
The size of root catalog
Size = Root_Size * 32
Root_Size is not used for FAT32 system

Total Sectors
The number of sectors is used in file system.

Table Size
The size of one copy of FAT - the number of sectors in one copy of FAT
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