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 .