By using this information, together with the Number of FATs and Reserved Sectors, you can compute where the root folder begins. Number of sectors occupied by each of the file allocation tables on the volume. Provides information about the media being used. For volumes larger than 65536 sectors, this field has a value of 0 and the Large Sectors field is used instead. The number of sectors on the volume if the number fits in 16 bits (65535). Therefore, the largest number of files in the root folder is typically 511, but you will run out of entries sooner if you use long filenames. Files with long filenames use up multiple entries per file. One entry is always used as a Volume Label. The total number of file name entries that can be stored in the root folder of the volume. The number of copies of the file allocation table on the volume. If the value is greater than 1, it means that the bootstrap code is too long to fit completely in the Partition Boot Sector.

The number of sectors from the Partition Boot Sector to the start of the first file allocation table, including the Partition Boot Sector. The default cluster size for a volume depends on the volume size and the file system. For most disks in use in the United States, the value of this field is 512.

Fat file system error