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In case of a SCSI drive, see that it's ID has been correctly set and the SCSI chain is terminated properly. You will not be able to see the drive if either of these errors crop up. Verify the CMOS setup utility to make sure that SCSI support has been enabled along with large SCSI drive support.
Basic HDD Checks
The first task is to check the extent of the Hard disk problem. To do this, place a clean boot disk or an emergency start disk in drive A i.e., the floppy drive and boot the system. After this, execute CD C:\ command to access the C drive Followed by the DIR command. If you are able to see the contents of the drive, it means that the boot files are either lost or corrupted, but the architecture of the disk is in place.
Also, try these options with the DIR command such as /AH or /AS switch (eg: DIR C: /AH or DIR C: /AS) to look for the system files and also the COMMAND.COM file in the root directory. In such cases, it is quite common to get a Disk Boot Failure message onscreen.
Provided that the hard disk can be accessed with the DIR command, type and enter the command Copy <filename> C:\ <Filename> (where filename is the name of the file to be copied) at the DOS prompt (with the clean boot disk still in the A drive). The IO.SYS, MSDOS.SYS, and COMMAND.COM system files should be copied from the boot disk (A:) to the hard disk drive (c:). Then turn the computer off, remove the boot disk from the A drive, and reboot the system from the hard drive.
