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CD read speed capped at 10x under Windows 98

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First post, by Caroline78

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I've recently built two almost identical Windows 98 rigs.

They both have ASRock P4i65G motherboards, Pentium 4 Northwood CPUs clocked at 2.8GHz, 512MB DDR RAM, SB Live! soundcards, Seagate 40GB IDE HDDs, SATA DVD-RW drives. The BIOS settings of both rigs are the same.

The only differences are:

Rig#1 has a Radeon 9250 video card. Windows 98 SE was installed without ACPI support.
Rig#2 has a Radeon 9600 Pro video card. Windows 98 SE was installed with ACPI support (setup /p j).

The read speed for CDs in Rig#2 is capped at 10x no matter what I do. The read speed in Rig#1 is the maximum speed of the drive.

I've tried using a different SATA cable, different SATA connector on the mobo, replacing the drive with a drive of a different make, you name it. The read speed was still capped at 10x.

Does anyone have an idea where the problem can be?

Thanks in advance for your input,

Caroline

Reply 3 of 3, by Caroline78

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UPDATE: It works now! I gave DMA another try and checked the DMA check box in Device Manager. Yesterday, it did nothing, today, it warned me I might mess up the OS completely. I did proceed, the computer turned itself off and after I booted, the DVD drive works at full speed!

Thanks!

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