sati_set_ata_features_exp
sati_set_ata_features_exp(register_fis, 0);
sati_set_ata_features_exp(register_fis, 1);
sati_set_ata_features_exp(register_fis, (sector_count >> 8) & 0xFF);
sati_set_ata_features_exp(register_fis, sati_get_cdb_byte(cdb, 3));