User`s guide

Using Storage Devices
Specifying the RT–11 Default Logical-Device Names
RT–11 has two built-in logical-device names:
• System (SY)
Specifies the system device and the volume containing the operating system
files. RT–11 boots (starts up) from this volume when you turn on the computer.
The system volume can be identified by its physical-device mnemonic and unit
number or by the logical (symbolic) name SY. You cannot assign SY.
• Default storage (DK)
Specifies the default storage volume, the volume that stores the files you create
when you do not specify a device to store them. This volume can be identified by
its physical-device mnemonic and unit number or by the logical (symbolic) name
DK.
When you first install the operating system, the system-device logical name
(SY) and the default storage-device logical name (DK) specify the same device.
However, at any time you can reassign the logical name DK to a different device.
Using Files, Volumes, and Devices 3–3