Enable Dma - TDK velocd Installation And User Manual

IMPORTANT: To achieve maximum performance for
reading and writing, direct access memory (DMA)
should be enabled for the veloCD drive and for all
other sources that you will be recording from,
including your hard drive, or other CD-ROM,
CD-RW and DVD-ROM drives.
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veloCD ReWRITER : User's Manual
ENABLE DMA (Direct Memory Access)
DMA allows you to free up CPU resources by accessing memory directly.
To ensure that DMA is enabled:
Windows 98/98SE/ME
1. In Windows, click the START button, then SETTINGS, then CONTROL PANEL.
2. Double click SYSTEM in the Control Panel folder, then the DEVICE MANAGER tab. You will see a list
of devices in your system.
3. Click the CD-ROM icon, and choose your veloCD drive's Properties button. You will see the drive
properties for the veloCD ReWRITER.
4. Ensure that the DMA box is checked ON under the Settings tab.
5. Repeat steps 1 through 4 for other devices that you will be recording from and recording to such as
your hard drive and /or second CD-ROM or CD-Rewriter.
6. Reboot your computer for the change to take effect.
Windows 2000
1. Click the START button on the Windows taskbar.
2. Select SETTINGS and then CONTROL PANEL from the menu.
3. Double Click the SYSTEM icon in the Windows CONTROL PANEL.
4. Select the HARDWARE tab then click on the DEVICE MANAGER button.
5. Click on the (+) sign beside IDE ATA/ATAPI CONTROLLERS.
6. Right click on the appropriate IDE channel (Primary or Secondary), right click PROPERTIES and
select the ADVANCED SETTINGS tab.
7. Set the "Transfer Mode" to "DMA if available". Device 0 is the MASTER device on the IDE channel
and Device 1 is the SLAVE.
8. Click OK to accept the change and then reboot the computer for the change to take effect.
Windows NT 4.0
Check in your CMOS and/or BIOS to make sure that DMA is enabled.
Windows XP
Windows XP will turn off DMA mode for a device after encountering certain errors during data transfer
operations. If more than six DMA transfer timeouts occur, Windows will turn off DMA and use only PIO
mode on that device. In this case, the user cannot turn on DMA for this device. The only option for the
user who wants to enable DMA mode is to uninstall and reinstall the device.
Windows XP downgrades the Ultra DMA transfer mode after receiving more than six CRC errors. Whenever
possible, the operating system will step down one UDMA mode at a time (from UDMA mode 4 to UDMA
mode 3, and so on). If the mini-IDE driver for the device does not support stepping down transfer modes,
or if the device is running UDMA mode 0, Windows XP will step down to PIO mode after encountering six or
more CRC errors. In this case, a system reboot should restore the original DMA mode settings.
All CRC and timeout errors are logged in the system event log. These types of errors could be caused
by improper mounting or improper cabling (for example, 40-pin instead of 80-pin cable). Or such
errors could indicate imminent hardware failure, for example, in a hard drive or chipset.
To enable DMA mode using the Device Manager:
1. Open Device Manager
2. Double-click IDE ATA/ATAPI Controllers to display the list of controllers and channels.
3. Right-click the icon for the channel to which the device is connected, select Properties, and then
click the Advanced Settings tab.
4. In the Current Transfer Mode drop-down box, select "DMA if Available" if the current setting is "PIO Only".
5. If the drop-down box already shows "DMA if Available" but the current transfer mode is "PIO Only",
then the user must toggle the settings.
Change the selection from "DMA if available" to "PIO only", and click OK. Then repeat the steps above
to change the selection to "DMA if Available."