On May 15, 2014, at 5:24 PM, Jordi Guillaumes i Pons <jg at jordi.guillaumes.name> wrote: El 15/05/2014, a les 23.22, Cory Smelosky <b4 at gewt.net> va escriure: sim> b tq TQ I/O error: Undefined error: 0 I/O error, PC: 157456 (TST 157520) Use a TS device, and don't forget to set it to read-locked. Hm... disks have controller-specific boot blocks, but I thought tapes were universal. Yes, the code says that showed up in V9.1. So I wonder why it would not work for you. paul