HP 3000 Manuals

Introduction to MPE XL for MPE V Programmers Migration Guide

Disk File Placement (changed) 

When you are using the FOPEN intrinsic and you specify the deviceclass 
option for disk devices in the device parameter, you are referring to a
volume set member(s).  That is, you are specifying a member, or members,
of a set of disk packs, rather than a set of specific disk drives.

A file is bound to a disk pack and not to a disk device.  In the HPFOPEN
intrinsic, only volume (disk pack) or volume class may be specified for a
file residing on disk. 


NOTE  When you specify ldev at file creation, ldev will be permanently
      associated with a specific volume that was mounted on the device
      specified by ldev at the time of file creation, and not permanently
      associated with the physical device, as is the case in MPE V/E
      based systems.

MPE/iX 5.0 Documentation