It looks like Partition Magic does not give "partitions" new drive letters.
You can do this in Start > Programs > Administrative Tools > Computer Management > Disk Management. Assign it a letter.
Recently some files became altered in a Win 98 partition & I would like to use DOS in the healthy Win98 partition to look at files in the unhealthy Win 98 partition. And maybe copy from one to the other. I know - it sounds dangerous but there's a few things I'd like to try before I throw away the HD.
You can't access it with Windows? It's worth a try. But, if you cannot access the drive in any way, you will need to save all the important files you can on the healthy Win98 partition, do a Restore (format, basically), reinstall Windows, put the important files back, reinstall programs, etc.. If it's only a damaged partition, you shouldn't have to get rid of the drive (assuming you can boot at all).
Good luck to you. 8-)