fatcon

    startAt = all_bytes[sector_size + 4 + offset * sector_size:]
    startCluster = (rootUpper + 1)

    if((myRange - 1) % 2 != 0):
        endCluster = upper
    else:
        endCluster = myRange-1

    count = 0
    start = rootUpper + 3
    prevClusterValue = 0

    # print(startAt[500:560])
    while count < endCluster:
        cluster = startAt[count : count + 2]

        clusterValue = struct.unpack("<H", cluster)[0]

        if(cluster != b'\x00\x00'):
            if(cluster == b'\xff\xff'):
                end = count + startCluster + 1
                result.append(str(start) + "-" + str(end) + " (" + str(end-start+1) + ") -> EOF")

            else:
                if(clusterValue - prevClusterValue > 1):
                    # start = count + startCluster
                    fragment = clusterValue * 2 + (rootUpper + 1) - 4
                    start = count + startCluster
                    # result.append(str(start) + "-" + str(count + clusterValue) + " (" + str(count + clusterValue-start+1) + ") -> " + str(fragment))
                prevClusterValue = clusterValue

        count = count + 2