Cdrecord will tell the drive to do laser power calibration
cdrecord does not do that to DVD+ media.
Wrong: cdrecord of course does a power calibration for DVD+
LOCAL BOOL
do_opc(scgp, dp, flags)
SCSI *scgp;
cdr_t *dp;
UInt32_t flags;
{
if ((flags & F_DUMMY) == 0 && dp->cdr_opc) {
if (debug || lverbose) {
printf("Performing OPC...\n");
flush();
}
if (dp->cdr_opc(scgp, NULL, 0, TRUE) < 0) {
errmsgno(EX_BAD, "OPC failed.\n");
if ((flags & F_FORCE) == 0)
return (FALSE);
}
}
return (TRUE);
}
So it's up to [non-NULL!] dp->cdr_opc. And what's dp->cdr_opc for DVD+
media?
grep OPC drv_dvdplus.c
(int(*)__PR((SCSI *, caddr_t, int, int)))NULL, /* no OPC */
(int(*)__PR((SCSI *, caddr_t, int, int)))NULL, /* no OPC */
(int(*)__PR((SCSI *, caddr_t, int, int)))NULL, /* no OPC */
A.
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