Phillip Susi <[email protected]> wrote:
>
> I thought that the code asked the drive for the max supported speed _for
> the loaded media_. I know I've been using pktcdvd without problem on
> cdrw media that is only rated for 4x on drives that support 12x or 16x,
> and based on the performance I've been seeing, it is only burning at 4x.
> Maybe your drive isn't reporting properly?
>
As I stated clearly before, I am having this problem with DVD+RW media. The
relevant code in pktcdvd.c (in function pkt_open_write) is:
if ((ret = pkt_get_max_speed(pd, &write_speed)))
write_speed = 16 * 177;
switch (pd->mmc3_profile) {
case 0x13: /* DVD-RW */
case 0x1a: /* DVD+RW */
case 0x12: /* DVD-RAM */
DPRINTK("pktcdvd: write speed %ukB/s\n", write_speed);
break;
default:
if ((ret = pkt_media_speed(pd, &media_write_speed)))
media_write_speed = 16;
write_speed = min(write_speed, media_write_speed * 177);
DPRINTK("pktcdvd: write speed %ux\n", write_speed / 176);
break;
}
read_speed = write_speed;
if ((ret = pkt_set_speed(pd, write_speed, read_speed))) {
DPRINTK("pktcdvd: %s couldn't set write speed\n", pd->name);
return -EIO;
}
As you can see, in the case of DVD+RW, the speed is set to the value stored
to write_speed by the function pkt_get_max_speed, whose documented purpose
(according to comments) is to return the drives reported maximum rewrite
speed capability. pkt_media_speed is only called in the case of CD-RW's. In
fact, it returns an error if the media is not CD-RW.
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