rem: struct scsi_unit *scsi_units, int n_scsi_units)
add: struct scsi_unit *units, int n_units)
context: add_linux_cd_drive (GList *cdroms, struct cdrom_unit *cdrom_s,		    struct scsi_unit *scsi_units, int n_scsi_units){	CDDrive *cdrom;	cdrom = g_new0 (CDDrive, 1);	cdrom->cdrecord_id = NULL;	cdrom->device = g_strdup_printf ("/dev/%s", cdrom_s->device);	cdrom->display_name = cdrom_get_name (cdrom_s, scsi_units, n_scsi_units);	cdrom->max_speed_write = 0; /* Can't write */	cdrom->max_speed_read = cdrom_s->speed;	if (cdrom_s->can_read_dvd) {		cdrom->type = CDDRIVE_TYPE_DVD_DRIVE;	} else {		cdrom->type = CDDRIVE_TYPE_CD_DRIVE;	}		return g_list_append (cdroms, cdrom);}