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How to detect DVD-R vs DVD-ROM vs DVD-RW drives

Subject: How to detect DVD-R vs DVD-ROM vs DVD-RW drives
From: Martin Bestmann <email@hidden>
Date: Wed, 23 Jul 2003 14:53:42 +0200

Hi,

I like to find out how I can find out if an DVD drive is a DVD-R or a DVD-ROM or DVD_RAM drive. I did some checking in the registry and found a key called DVD features. Looking into the "IOSCSIMultimediaCommandsDevice.h" file I find constants that pretty much match the feature key from the registry.
What is confusing is that on my PowerBook G4 17" (SuperDrive) is identified as a Matshita DVD-R UJ-815. If I check the DVD Features (0x77) it revels that this should be a DVD-RW drive. Is that true or is the DVD Features information wrong?

Thanks,

Martin
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