It appears you are using EZ-BIOS and it has become corrupted. In order to fix this issue, EZ-BIOS needs to be written back to the drive.
To do this, boot to a Windows 95, 98, or Windows Millennium Startup diskette. At the A: prompt insert the Data Lifeguard Tools diskette, type DLGEZ /MBR and press ENTER. A message should appear stating "EZ-BIOS Reinstalled on Drive x: (X would be Drive 0, Drive 1, Drive 2 or Drive 4 depending how the hard drive(s) is configured in the system). Once EZ-BIOS has been reinstalled, you should have access to the drive and all of your data.