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DVD+RW/+R ReWritable Drive
User’s Guide
- 54 -
PowerDVD
Q: What are the differences between hardware and software DVD
solutions?
A: The main difference between hardware and software DVD decoders is
CPU utilization. Software DVD will utilize a much larger portion of the CPU. A
software decoder has the great advantage of not taking up a PCI slot in the
PC and has equivalent performance to hardware.
Q: Can scratches affect a DVD disc?
A: Most scratches will cause minor channel data errors that are easily
corrected. Major scratches may cause uncorrectable errors that will cause an
I/O error on a computer or show up as a momentary glitch in DVD-Video
picture. DVD data density is physically four times that of CD-ROM, so it's true
that a scratch will affect more data. But DVD error correction is superior to
CD-ROM error correction. It's also important to realize that MPEG-2 and Dolby
Digital compression are partly based on removal or reduction of imperceptible
information, so decompression doesn't expand the data as much as might be
assumed.
Q: I've inserted a DVD disc in the DVD-ROM drive with DVD player
running and it did not start playing. Why?
A: In the drivers for most DVD-ROM drives, there is an option that is
commonly turned on by default called “Auto-Insert Notification”, which lets
the operating system know when a DVD or CD disc is inserted into the DVD-
ROM drive. The purpose of the feature is to begin running software or to
begin playback of a disc when it is first inserted into the drive, without the
need for running an application. If this option is turned off, our DVD player
application is not notified that you inserted a DVD disc. To turn this option on,
use the following procedure:
• Select “Control Panel” from the “Settings” list in the “Start” menu.
• Double-click on the “System” icon, and then select the “Device
Manager” tab.
• Locate the “CD-Rom” listing and single-click on the entry for your
DVD-ROM drive.
• Click on the “Properties” button, and then the “Settings” tab.