Data Fields
fds_op_code_t	op_code
union {
struct {
fds_init_step_t step
} init
struct {
fds_header_t header
fds_write_step_t step
uint16_t page
uint16_t chunk_offset
uint8_t chunk_count
uint32_t record_to_delete
} write
struct {
fds_delete_step_t step
uint16_t file_id
uint16_t record_key
uint32_t record_to_delete
} del
};