I must make a correction to a remark I made on a reply of Tony. Tony wrote to FORMAT the RK07 pack. I told that under RT11, you can use INIT, but to FORMAT you need XXDP. Allthough that can be true for some media, I was wrong regarding the RK07. Perhaps I was a bit mislead by my RK07 drive, but the following tests show that Tony was correct. I booted RT11 on the 11/34 from DL0:. These are the commands and their responses that I got, after I loaded a pack (and READY on) .DIR DM0: ?DIR-F-Error reading directory .INIT DM0: DM0:Initialize: Are you sure? Y ?DUP-F-Size function failed .FORMAT DM0: DM0:FORMAT-Are you sure? Y ?FORMAT-F-Device not ready ?FORMAT-I-Formatting aborted Looking at the RT11 response, it seems that FORMAT is supported for the RK07, just as Tony said! It also shows that I am not completely out of the weeds ... - Henk. This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law. If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message. Thank you for your cooperation.