dcloud,
Just to reiterate a bit about what Nelviticus suggested:
He's leaning towards it being a hardware issue, which is certainly a possibility, but like he said you should definitely check the advanced properties of the IDE controller in Device Manager. Make sure it's running in DMA mode 2 (what your drive supports) and not the slower, less efficient PIO Mode.
Also, you said that you were going to avoid InCD. Well before you go out and buy another brand of DVD's, try one you already have (non-formatted DVD that's straight out of the packaging) using Nero Burning ROM.
firewolfrl,
Yes, I do recall our past conversation on this. However, I want you to know that I wasn't saying you're wrong, nor did I necessarily disagree with you to try the older cable. I wanted to make the point that many ATA/33 (UDMA mode 2) devices can run fine on 80-pin cables. An 80-pin cable has the extra shielding necessary to achieve faster transfer modes (ATA/66, ATA/100, ATA/133).
I have respect for you being in the repair business, but you probably know as well as I do that it's easy to fall victim to routine on fixes without understanding "why" and missing the pattern. There is a transfer compatibility mode called IDT (Independent Device Timing). All EIDE drives use this. This is what allows one device to work at ATA/33 and another at ATA/100, for example, on an 80-pin IDE cable.
The "pattern" is usually this...the optical drives that have to use an old 40-pin cable are not true EIDE (Enhanced IDE) drives. Some are just plain IDE. Plain IDE drives can work fine on 80-pin cables, except for when a faster device shares the same cable. That's when the problem sets in. Unless both devices are EIDE, then different transfer modes isn't going to work well if at all.
The good news is that it's not very common anymore, especially with burners. Pioneer has a few models out there that have to use an old 40-pin cable, but besides a few brands/models like those, it's pretty rare. Also, the challenge is that unless the burner is sharing the cable, it should never matter, in theory, if the cable is 40 or 80 pins.
And as a side note for others new to this, there's no difference between an ATA/100 and an ATA/133 cable for example - both are 80 pins. When a cable is labeled as such, that's part of the marketing to let the average consumer know it will work with their ATA/133 hard drive they just bought. There are just 40-pin and 80-pin cables, with 40-pin being restricted to ATA/33 or lower.
~cdogg
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