Assuming the drive itself is not slow, this problem is usually caused by the system BIOS. You can try to correct this issue as follows:
- Some BIOS brands and versions will not automatically detect the mode properly, so you can try setting the PIO mode in the BIOS as appropriate (and nowadays, mode 4 would be your choice).
- Some BIOS brands and versions support UDMA directly. If such a setting is available in your BIOS, try enabling it.
- Ensure that you are using an 80-conductor IDE cable, where applicable.
- Consider using the third-party DOS UDMA Driver available here, with the understanding that it is not officially supported and is to be used at your own risk.