MajorFunction ARRAY

create    0

create_named_pipe  1

close   2

read   3

write 4

query_information 5

set_information 6

query_ea 7

set_ea          8

flush_buffers     9

query_volume_information 10

set_volume_information 11

dircetory_control 12

file_system_contorl 13

device_control  14

internal_device_control 15

shutdown 16

lock_control 17

cleanup 18

create_mailslot 19

query_security 20

set_security 21

power  22

system_ctl 23

device_change 24

queyr_quota 25

set_quota 26

pnp 27

pnp_power 27