[QUOTE=Albert;2714237]Some DVD-ROM drives support user-written discs (-R, +R, -RW, +RW, etc). Some do not.
Sometimes it’s a hardware thing [or it is applicable to all drives of a given make & model; regardless of firmware, you cannot enable playback of such discs], sometimes it’s a firmware thing. I think in each case, though, the drive should be able to tell you what it can and cannot do, by responding to a particular query (I wouldn’t know which multimedia command that would be). That information is frequently accurate.
I know I have an old Pioneer DVD-ROM drive from 1999/2000 that seems to audibly struggle trying to read back -R/+R/etc, and it reads at a nonstandard speed, and may even fail at reading without warning.[/QUOTE]
The point is this: I know commands to get some reading and writing features. I know the query command to get WRITING DVD-R DL but I cannot get READING DVD-R DL. So I am wondering, by getting the writing attibute and a drive cannot write this type of disk, can I say for sure that the drive cannot read it too? Are there drives that can read DVD-R DL but they cannot write them? I do not want to tell me how to get this attribute, just tell me if exists any drive that can read DVD-R DL but it cannot write it. I have the same problem with DVD+RW DL disks.