Ratoc Systems PCIFW1U - Manual (Page 84)

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10-3.When playing back the captured file is choppy or jerky.
The data rate from a DVCAM is 3.6MB/sec. If your HDD sustained data write rate is lower
than 3.6MB/sec, a captured file may get choppy or jerky when you play back the file.
To avoid this trouble, enable DMA function of your HDD, following steps through.
1.Open “Device Manager”.
2.Select your Disk drive as shown below and click the Properties button.