Toshiba Satellite 1955-S806 User Guide - Page 205
Secondary IDE Channel DMA setting, Slow playback performance.
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205 If Something Goes Wrong Resolving a hardware conflict Slow playback performance. DVD playback is a resource intensive application. Other applications and/or changes to your system hardware, software or configuration can impact playback performance. If playback is slower than normal, try: 1 Closing any other open applications to improve the performance of the DVD playback. 2 Ensuring DMA (Direct Memory Access) is turned on. See "Secondary IDE Channel DMA setting" on page 205 for more information. 3 If you have installed new hardware, ensure the component's drivers support Microsoft® DirectX® 8.1 or higher and WinDVD. Contact the manufacturer of the component. 4 Verifying that your display driver resolution, color depth and refresh rate are optimal for DVD playback. (Some systems do not support video overlays if these parameters are not optimal.) Try lowering these settings to improve performance. Secondary IDE Channel DMA setting To ensure the Secondary IDE Channel DMA setting: 1 Click Start, Control Panel, then Printers and Other Hardware. 2 Click the System icon. The System Properties window displays. 3 Click the Hardware tab. 4 Click the Device Manager button 5 Click "+" to open the IDE ATA/ATAPI Controllers.