This from Western Digital site:
"The Windows 95/98 Device Manager shows the hard drives installed in a system. In many cases when you view the drives within Device Manager, it identifies them as Type xx. Sometimes it identifies them by displaying the actual model number. Why isn't the drive model number always shown? Does this mean that you are getting less than the full performance from your drive? Is there a special driver you need to install?
The drive model number within the Windows 95/98 Device Manager is usually not shown unless you have some type of third party driver installed. The lack of a model number does not affect the performance of the drive, although a third-party driver can offer improved performance. If you would like to use a third party driver, check if your motherboard manufacturer has one available for your system. If they do not, you may be able to obtain a suitable driver from the motherboard chipset manufacturer (i.e. Intel, Via, etc.). Make sure you understand the driver requirements and verify your system meets these requirements before installing the driver."