CDROM Won't Use DMA

[bustasaint]

I am running Windows XP.

I installed a Lite-On 52X CDROM (LTN526S)

But Windows selects PIO instead of UDMA.

The CDROM is installed as the slave to a LiteOn 32X CDRW which is using UDMA Mode 2.

This may not apply but I cannot put any of the CDROMS as a slave to the hard disk.

How can I get both optical drives to use DMA simultaneously?

I have a spare RAID channel EIDE port.

HELP ...

[gamehead200]

I would have connected the regular CD-ROM drive as the master, not the slave...It can be connected as a slave if a hard drive were connected as the master...Dunno if this helps...

[zipp51]

I would never connect an optical drive to a hard drive.Your installation is correct with master being the cdrw and cdrom the slave.These are your specs for that model so it does support DMA.

Speed :

CD-ROM 52x ( 22x ~ 52x, Average 38x )

Interface :

ATAPI-E / IDE

Sustained Transfer Rate :

3300 ~ 7800KB/sec ( Average : 5700KB/sec )

Burst Transfer Rate :

PIO mode 4 ( 16.6MB/sec )

SW DMA 2 ( 8.3MB/sec )

MW DMA 2 ( 16.6MB/sec )

Ultra-DMA 2 ( 33.3MB/sec)

Access Time :

80ms ( typical )

Support Disc Format :

CD-ROM / XA, CD-DA, Mixed-Mode, CD-I, VCD, Photo-CD, CD-Extra, CD-TEXT

CD-R, CD-RW, Single / Multi-Session, Karaoke-CD, I-Trax, E-CD, 8cm & 12cm disc

Support Operating System :

Windows 95 / 98 / NT / ME / XP / 2000

MTBF :

120,000 Power On Hours with 10% Duty

Audio :

S/N >= 60dB

Earphone >= 0.5 Vrms @ 1KHz

Temperature & Humidity :

Operating : 5C to 45C; RH : 15% to 80%, Non-Condensing

Non-Operating : -20C to 60C; RH : 15% to 90%, Non-Condensing

Dimension :

W x H x D : 145.8 x 41.3 x 190.0 mm

Weight : <= 1.0Kg

User Interface :

LED Indicator, Stereo Ear Phone Jack, Volume Knob, Stop / Eject Button, Play / Skip Button

IDE Socket, Power Input, Analog Audio Output, Digital Out, Master / Slave / CS Jumper

Make sure you are using an 80 pin cable and the blue end is on the motherboard.Select DMA if available in the hardware device manager under IDE ATA ATAPI Controllers secondary IDE.

Also if you are using an Intel chipset read this because UDMA might be disabled by default by Windows.

UDMA66

According to Microsoft, UDMA66 mode is disabled by default on a Windows computer with an Intel chipset that supports UDMA66. To enable UDMA66 mode you need to:

Make sure the device supports UDMA66 mode

Use a 80-pin IDE cable with the proper pin cut

Add a registry key

To add the registry key:

Start the Registry Editor

Go to HKEY_LOCAL_MACHINE \ System \ CurrentControlSet \ Control \ Class \ {4D36E96A-E325-11CE-BFC1-08002BE10318} \ 0000 \

Right-click an empty space in the right pane and select New > DWORD Value

Name the new value EnableUDMA66

Double-click this new value, and enter 1 as it's Value data

Close the registry editor

Restart Windows for the changes to take effect

When you restart your computer, the UDMA66 will be enabled if it is supported by the hardware.

Let us know what kind of mother board or proccessor you have.

[XPerties]

I would never connect an optical drive to a hard drive.

I have said this for years, but on a recent TechTV show, they put that to test. Using HDTech (harddrive benchmark) they ran test on WD drives connected to IDE with another HD on it and then swaped them with cdroms on the IDE channel. All the benchmarks never lost speed or perfomance.

Seems other companys as well as plextor and WD have teamed up and said this is true and no perfomance is lost on any IDE setup.

[zipp51]

I guess I've been using that rule of thumb for years,and never really investigated.Thanks for the info Xperties.

[XPerties]

I guess I've been using that rule of thumb for years,and never really investigated.Thanks for the info Xperties.

I was surprised as well, but they showed the benchmarks live on tv . I haven't tried it myself but maybe in the future I will.

[rik]

Busta

Dunno if you've gotten it fixed yet or not but one thing I have done in the past is deleting the 2ndary IDE channel from Device Manager, then booting into the bios. From there you should be able to find the option to clear the MB's NVRAM, sometimes referred to as resetting the configuration data. Upon reboot it will reinstall the 2ndary channel, reidentify all it's HW, and *should* set the drive back to UDMA as long as it is turned on in the bios. This can and has been an issue in Windows since Win 2k but it seems to be happening even more now with higher speed drives.

[bustasaint]

I solved the problem by removing the secondary IDE device driver.

Then rebooting. The device was automatically reinstalled.

Then I entered the properties page and set the drive to DMA.

It immediately switched to UDMA mode 2.

This feel much better, the percieved speed of the computer has increased.

Me Irie Man...

Thanks...

[lfotto]

Good call, Rik. I just love this forum. I had the same problem and removing the 2nd channel and rebooting fixed my 52x cd-rom also. It was a PIO 2 and changed to UDMA 2.

Thanks for the info.

[rik]

Ah does what Ah cans....

Glad it worked for ya...

[malukitojr]

to make a device use udma instead of PIO u have to go to the device manager and under the IDE ATA/ATAPI controllers you have to change the proprieties of the primary and secondary channels to UDMA

[lfotto]

That was the initial problem. It would not change from PIO until it was deleted and reinstalled to redetect the hardware.