emergency repair disk

rdisk and rdisk/s cover just your NT Workstation. Your Win 98 is not covered with this.
rdisk/s differs from rdisk in that it saves SAM database (security). rdisk usually saves only hardware part of your registry and is only a very basic security measure. It will only cover you if your start up environment gets corrupted. Slightly better way of protecting your registry is to use REGBACK utility from Windows NT 4.0 Resource Kit. To protect entire system, you should run ntbackup (with option to save registry). However, ntbackup requires tape. Another way of securing your system is by taking an image of your drive(s). You can do that with Symantec Ghost software. Third way of protection (which I use on important servers) is to install secondinstance of NT on another partition. I then boot from that second instance of NT and take a backup or (Winzip) of important directories on the first instance of NT.
One more thing. The disk you made with rdisk is not bootable. To make bootable disk, format a floppy on NT (not Win98) and copy following files:
- boot.ini
- ntldr
- ntdetect.com