ea_deviceparameters

I need to use the ea_deviceparameters structure in a deviceiocontrol call.MSDN describes the structure and the last field is
EDP_SECTORTABLE DB MAX_SECTORS_IN_TRACK * SIZE A_SECTORTABLE DUP (?)
and if I want to obtain parameters of a hard disk, and the language used is c++, what is the last member of the structure ? I mean what would be SIZE if I use byte[SIZE] ?