Does connecting ATA CD-ROM/DVD-ROM drive and CD-RW drive to the same channel causes buffer under-run? Many people say yes and even Nero BurningROM warns the users about that. However, it may not be the cause for most of the buffer under-run cases. Actually, insufficient source reading speed is often the real cause for buffer under-run. Connecting two drive on the same ATA channel may cause some performance penalty and their operations may interfere each other. However, the performance should be sufficient for CD copying.
Provided that your system is properly configured and there is no conflict between the two drives, CD copy can be done successfully even though the drive for data reading is only marginally faster than the writer. Here, marginally faster means slightly faster actual speed, not the maximum speed indicated. For example, Sony DDU-220 offers something around 13-32x full CAV for printed mode 1 CD while it offers only 4-10x full CAV for mode 2 CD or all CD-R/RW media. If we are writing to Yamaha 2100, 16x (well, it's actually 12-16x partial CAV) copy can be done successfully for printed mode 1 CD while it will fail for mode 2 CD or all CD-R/RW media. If I replace the Sony DVD-ROM with a Plextor 121032 as the reading source, all CDs can be copied at 16x (P-CAV) speed. Just keep in mind, insufficient source speed is often the cause for buffer under-run.
Provided that your system is properly configured and there is no conflict between the two drives, CD copy can be done successfully even though the drive for data reading is only marginally faster than the writer. Here, marginally faster means slightly faster actual speed, not the maximum speed indicated. For example, Sony DDU-220 offers something around 13-32x full CAV for printed mode 1 CD while it offers only 4-10x full CAV for mode 2 CD or all CD-R/RW media. If we are writing to Yamaha 2100, 16x (well, it's actually 12-16x partial CAV) copy can be done successfully for printed mode 1 CD while it will fail for mode 2 CD or all CD-R/RW media. If I replace the Sony DVD-ROM with a Plextor 121032 as the reading source, all CDs can be copied at 16x (P-CAV) speed. Just keep in mind, insufficient source speed is often the cause for buffer under-run.
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