Found this - does it help?
Q11. How can I increase hard disk capacity?
A11. If you want to upgrade or replace your IDE hard disk drive with one of the newer large capacity IDE disks (> 528MB capacity), there are three general solutions:
a BIOS upgrade
an Extended IDE (EIDE) controller card
software drivers supplied by most manufacturers of large EIDE hard disks.
An up-to-date BIOS is the most trouble-free solution for using large IDE hard disks. It is compatible with both your motherboard and nearly all major operating systems. The BIOS installed on your motherboard must provide Logical Block Addressing (LBA), at minimum, to support large hard disk drives.
Any Phoenix BIOS identified as Version 1.xx is limited to handling IDE hard disks no larger than 528MB. The Award 4.28 and 4.32A BIOS used in the Anigma EISA 486 board has the same limitations. As a general rule, any Phoenix BIOS identified as 4.xx is capable of handling EIDE hard disks up to 2.1GB in capacity. The latest MicroFirmware BIOS upgrades allow you to install the largest EIDE hard disks available. Contact MicroFirmware for BIOS upgrade information. All MicroFirmware BIOS upgrades support LBA plus other advanced BIOS features.
If you decide to investigate an EIDE controller card solution, you must have one which supports LBA, at minimum.
Software solutions to the large IDE hard disk problem are not universal. They apply only to the operating system that you use, sometimes requiring an exact software release to operate correctly. Generally, they require that you set up a conventional DOS partition on the hard disk, then run a software install program which adds drivers and other special software to your system to give you access to the additional hard disk capacity.
Finally, if your system uses SCSI hard disks, refer to the manufacturer-supplied documentation for the SCSI host adapter installed on your system. This documentation describes the capacity limitations, if any, of the SCSI host adapter. Modern SCSI host adapters support very large hard disks with little extra effort on your part.
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