Normally there is absolutely no problem in not using all of the disk. RT and the DU handlers will only care about what you tell them about (via PORT,UNIT,PART). The only thing you might have to worry about is a program which uses the SPFUN which allows total access to the disk (which is not something which you will find in any of the standard RT utilities). If you only run distributed software or your own code, there will be no problem (modulo any bugs that might be lurking). Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com | | Unix Support Engineering Group | (home): mbg!world.std.com | | Compaq Computer Corporation | addresses need '@' in place of '!' | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+