OGL-Bacchus 0 Posted July 12, 2001 I've been troubleshooting a problem w/my new Plextor W1610AT CD-R drive. Scouring thru these (and other) forums, the advice I've found - to ensure that UDMA is enabled - recommends the following: -Click the device manager tab -Double-click my IDE ATA/ATAPI icon -Click either the primary or secondary DMA channel tab (depending on where my device is installed) -Click the Advanced tab to verify that I have UDMA enabled Well...here's my problem: (1) My IDE ATA/ATAPI tab lists two different ULTRA DMA channels, but its not distinguished by either primary or secondary; they're just listed as simply Ultra ATA Channel (2) When I click the properties of each Ultra ATA Channel (above), I don't see any tab for "Advanced Settings" (3) Returning to my BIOS to verify my UDMA options for my CD-R (and HD), I find two options: PIO MODE (which is set to 4) and ULTRA DMA MODE (which always sets to "disabled", despite changing it to 0, 1, 2, 3, 4 or 5). Guys, I'm stumped! I've done my homework, followed the doctrine of RTFM, read several posts on this topic, but I'm still confused. Can any of you lend any advice? My questions are as follows: (1) How do you distinguish (in device manager) between your PRIMARY and SECONDARY ATA/ATAPI devices? They aren't distinguished from each other in my panel...it reads just "Ultra ATA Channel". (2) How do you get the 'Advanced' tab to show up? I'm logged-in as administrator (using W2K). Does NTSF (vs. FAT32) make any difference? (3) What is the difference (BIOS) between PIO MODE (set at 4) and UDMA MODE (which always defaults to 'disabled')? (4) What is the best means to troubleshoot your CD/CD-R drives -- to verify that you're maximizing your MBs/device's full potential? As always...my deepest thanks and appreciation in advance. Share this post Link to post
Wolf87 0 Posted July 13, 2001 When PCI bus master DMA is active, the CPU (10% use) deals only with a single interrupt at the time the IDE command completes. In standard PIO operation the CPU (90% use) services an interrupt , every time a block of data becomes available from the device. Examine the following key in Registry: HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\Scsi\ScsiPort x 0 is primary and 1 is secondary ide device. Unless a Raid or Scsi controller is present because then ScsiPort 0 is a raid or scsi device; 1 is primary controller and 2 is secondary controller. Scsi is always detected first and even IDE controllers are detected as being Scsi. Just open this key further for identifcation of attached physical devices whether hard disk, CD-ROM, DVD or CD-RW. To activate UDMA, read this: http://www.arstechnica.com/tweak/nt/udma.html Or get the Power DVD 3.0 Demo that includes a small program to check and activate UDMA. Unless Service Pack 2 is installed, UDMA 66 and UDMA 100 are by default desactivated in Windows 2000. Share this post Link to post
