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Data (files and directories)Root DirectoryFAT 2FAT 1Reserved Area

Reserved Area

Table
|Graphic
BS_FilSysTypeBS_VolLabBS_VolIDBS_BootSigBS_Reserved1BS_DrvNumBPB_TotSec32BPB_HiddSecBPB_NumHeadsBPB_SecPerTrkBPB_FATSz16BPB_MediaBPB_TotSec16BPB_RootEntCntBPB_NumFATsBPB_RsvdSecCntBPB_SecPerClusBPB_BytsPerSecBS_OEMNameBS_jmpBootReserved Area Content

BPB (BIOS Parameter Block), sometimes called “boot sector”, “reserved sector” or “0th sector” is the first important data structure on a FAT Volume

BPB Size

BPB_RsvdSecCnt * BPB_BytsPerSec