Partition 1 offset = LBA 0x800
                   = 0x100000
bsSectorSize = 512

first_fat_sector = bsResSector
               = 32 => (32*512) = 0x4000
               = 0x100000 + 0x4000
               = 0x104000
               
total_fat_sectors = fat_sectors * number_of_FATs
                  = 2001 * 2
                  = 4002

total_fat_size = total_fat_sectors * bsSectorSize
              = 0x1F4400
              
first_data_sector = FatStartSector + FatAreaSize
                  = 0x104000 + 0x1F4400
                  = 0x2F8400
                  
FAT table look up

    if the cluster we got from the table entry was cluster 354
    fat_sector = 354 / 128
               = 2
    fat_entry  = 354 mod 128
               = 98
               
    so we load the 3rd (indexed from 0) fat table sector and read the 98th entry
    for the cluster chain.
    
    // bad fake code below
    fat_table_offset = (first_fat_sector + 2) * 512
    fat_table = *(fat_table_offset)
    disk_read(fat_table[98])