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Recommended Book
The Hard Disk Technical Guide (Micro House Technical Series)
By Micro House
Micro House
Price: $1.00

Home » Storage
Everything you Need to Know About ATA-66, ATA-100 and ATA-133 Hard Disks
Author: Gabriel Torres
Type: Tutorials Last Updated: October 22, 2004
Page: 4 of 6
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Bus Mastering Drivers

This is the most critical point for users that still run Windows 95, 98 and ME, because the bus mastering is not enabled by default. Thus, if you simply connect your hard disk to your computer it will be accessed only up to 16 MB/s, even if all other criteria we discussed matches. Windows XP automatically enables bus mastering, but the chipset manufacturers claim that using their drivers instead of Microsoft's you can achieve a better disk performance on your PC.

You will need to install two drivers: chipset driver and IDE (bus mastering) driver. Sometimes these two drivers are available at the same package, as is the case for VIA drivers. Sometimes you will need to download two separated files, as for SiS drivers. Intel call their chipset driver as "Inf Update File". To download them, you will need to know your motherboard chipset manufacturer and model and download the drivers from the chipset manufacturer website. Your can find out the chipset manufacturer and model using a hardware identification program, like Hwinfo, Sandra and Everest (all available at our download section). After that, go to our chipset manufacturer list and click on Driver to download them. Download the latest version available and install them.

If you go to Windows Device Manager (System icon in Control Panel) you will see something like Figure 4 under System devices before installing the chipset driver. As you can see, the chipset is listed as "standard" (PCI standard host CPU bridge and PCI standard ISA bridge), meaning that the chipset wasn't detected by Windows.

Bus Mastering
Figure 4: Before installing the chipset driver. Notice that the chipset is listed as "standard".

After installing the chipset driver, the chipset will be correctly listed, as you can see on Figure 5. The standard drivers were replaced with specific drivers. The example on Figure 5 is of a motherboard with Intel 440BX chipset.

Bus Mastering
Figure 5: After installing the chipset driver. The chipset is now being recognized correctly.

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