Belkin F5U208-MAC Manuel d'utilisateur télécharger pdf (Page 20)

Recommendations (continued)

Recommendations

Enhancing Capture Performance

It is recommended that you perform the following steps to enable

the DMA transfer on your PC. Enabling this feature lets the

VideoBus II write data directly to the hard drive by bypassing

the microprocessor. In most cases, this will improve the quality

of the capture performance and provide for smooth, clear video

captures. If you are not sure if you need to enable DMA, install

the VideoBus II and perform a test by capturing thirty seconds

of video from a video source. If the capture is "choppy" or not

smooth, enabling the DMA should take care of this problem.

Enabling DMA

Your hard drive may not be able to sustain a high enough data

rate to provide a smooth capture of a video stream. The

performance of Ultra DMA hard drives is improved if the “DMA

transfer” option is enabled for the drive. This solution should

be approached with caution, as not all hard drives support this

feature, and they are not compatible with every system. If you

are unsure as to whether your system can handle DMA

transfers, please contact your hardware manufacturer.

To enable DMA transfer for hard drives under Windows:

1. On the Windows task bar, click Start, select Settings, then

click on Control Panel.

2. Double-click the System icon.

3. Click the Device Manager tab.

4. Find the device named “Disk Drives”, and click this icon.

You should see several drives listed. Find “Generic IDE

Disk Type 47”.

5. Highlight this drive, and click the Properties button.

6. Click the Settings tab, and select the DMA control.

7. Click “OK” to exit this dialog, then click “OK” to exit the

Properties dialog.

8. Restart your computer to enable the changes.

Please note that if your system has a custom device driver for

your hard drive, it may not be possible to enable DMA.

Defragmenting your Hard Disk

To improve the performance of your captures, ensure that your

disk drives are defragmented before capturing video. Regularly

defragmenting your hard disk will help maintain optimum read

and write speeds, which is necessary for capturing video at

higher data rates.

To defragment your hard disk:

1. Shut down all running programs.

3. Launch the Windows “Disk Defragmenter” program from

the Start menu by pointing to Programs >> Accessories

>> System Tools >> Disk Defragmenter.

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Belkin F5U208-MAC Manuel d'utilisateur Page 20

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