CMC MAG-D04-00 in Optiarc AD-5170A

[qanda]This thread is about the Optiarc AD-5170A. Click here to see full specs[/qanda]Hi,

Please indulge me here, I have read as much as I can bear on this issue and am still confused…

I have some CMC MAG-D04-00 dual layer media. The data printed on the disk says it is 2.4x media. However when I try to burn the media in my Optiarc AD-5170A using ImgBurn the only reported supported write speeds are 4x up (see below):

Optiarc DVD RW AD-5170A 1.14 (ATA)
Current Profile: DVD+R DL

Disc Information:
Status: Empty
Erasable: No
Free Sectors: 4,173,824
Free Space: 8,547,991,552 bytes
Free Time: 927:32:74 (MM:SS:FF)
Supported Write Speeds: 4x, 6x, 8x

DVD±R DL Boundary Information:
L0 Data Zone Capacity: 2,086,912
Changeable: Yes

Physical Format Information (ADIP):
Disc ID: CMC MAG-D04-00
Book Type: DVD+R DL
Part Version: 1
Disc Size: 120mm
Maximum Read Rate: Not Specified
Number of Layers: 2
Track Path: Opposite Track Path (OTP)
Linear Density: 0.293 um/bit
Track Density: 0.74 um/track
First Physical Sector of Data Area: 196,608
Last Physical Sector of Data Area: 16,580,607
Last Physical Sector in Layer 0: 2,283,519

Physical Format Information (Last Recorded):
Disc ID: CMC MAG-D04-00
Book Type: DVD-ROM
Part Version: 1
Disc Size: 120mm
Maximum Read Rate: Not Specified
Number of Layers: 2
Track Path: Opposite Track Path (OTP)
Linear Density: 0.293 um/bit
Track Density: 0.74 um/track
First Physical Sector of Data Area: 196,608
Last Physical Sector of Data Area: 16,580,607
Last Physical Sector in Layer 0: 2,283,519

The burns often fail. I found this link which seems to indicate the same problem with NEC drives (same thing right?):

Note that the NEC 4550 only indicates a supported write speed of 4x up. However the other drives tested with the media can all burn at 2.4x, which seems to indicate that the issue is with the drive, is this correct? Incidentally, I have tried other DL media in the drive and can write these at 2.4x. Is there any way to force the drive to limit burns to 2.4x?

Thanks in advance for your respons(es).

I know it’s obscure but hasn’t anyone come across this before?

I’ll not buy that media again but I want to avoid turning the ones I do have into coasters if at all possible.