I had recently installed Win 7 Ultimate x64. I found that the cd drive would not read DVD DL. I tried all methods(incl all KB articles) and finally decided to go back to x32 hoping that the change would cure it. No chance. It reads all other types of DVD ok and writes too. I have tried several different DVD DL. I used an external iOmega DVD drive - and found that 10% of the time that drive would read the DVD DL - in most of these 10% cases only for a short time - after reading a folder or two the drive would disappear!
my system:
OS Name Microsoft Windows 7 Ultimate
Version 6.1.7600 Build 7600
Processor Intel(R) Core(TM)2 Duo CPU E7400 @ 2.80GHz, 2793 Mhz, 2 Core(s), 2
BIOS Version/Date American Megatrends Inc. 0412, 10-06-2009
SMBIOS Version 2.5
Boot Device \Device\HarddiskVolume3
Locale India
Hardware Abstraction Layer Version = "6.1.7600.16385"
Installed Physical Memory (RAM) 4.00 GB
Total Physical Memory 3.49 GB
Available Physical Memory 2.25 GB
Total Virtual Memory 6.98 GB
Available Virtual Memory 5.65 GB
Page File Space 3.49 GB
Page File C:\pagefile.sys[/COLOR]
DVD Drive - Samsung (TSST Corporation) SH-S203D DVDRW ATA
my system:
OS Name Microsoft Windows 7 Ultimate
Version 6.1.7600 Build 7600
Processor Intel(R) Core(TM)2 Duo CPU E7400 @ 2.80GHz, 2793 Mhz, 2 Core(s), 2
BIOS Version/Date American Megatrends Inc. 0412, 10-06-2009
SMBIOS Version 2.5
Boot Device \Device\HarddiskVolume3
Locale India
Hardware Abstraction Layer Version = "6.1.7600.16385"
Installed Physical Memory (RAM) 4.00 GB
Total Physical Memory 3.49 GB
Available Physical Memory 2.25 GB
Total Virtual Memory 6.98 GB
Available Virtual Memory 5.65 GB
Page File Space 3.49 GB
Page File C:\pagefile.sys[/COLOR]
DVD Drive - Samsung (TSST Corporation) SH-S203D DVDRW ATA