I replaced a HP Superstore Dat 40 with another HP Superstore Dat 40, but my backupedge software keeps putting up error code 1 (device not found) I have tried reinstaling the drive as DAT Alad stp 0 6 0 0. I'm not a computer expert but willing to have a go. I went into Backupedge to try and format a new tape to see if device working, and got message cannot open /dev/rstp0 .

Did you set the jumpers/dip switches on the tape to device 6. (Dip switch 2 and 3 on)
Type <ctrl-a> during the boot-up when prompted, you will then be able to see the scsi id of all devices attached to the controller.

Now that you have run mkdev tape several times, you should make sure that you only have one tape configured.

Is this SCO 6.0.0 or Unixware? I have had the SCO 6 operating system see a replacement tape driver as new tape drive, and the OS set it up as rStp1. Have backupedge check resources again and see if it comes up with a new tape drive resource or check the OS and see if you now have a device at rStp1.