EDD_rw
error = EDD_rw(rw, dev, off, nsect, bb);
static int EDD_rw (int, int, u_int32_t, u_int32_t, void *);
error = EDD_rw(rw, dev, off, nsect, bb);
static int EDD_rw (int, int, u_int32_t, u_int32_t, void *);