.R LDF
*L G HEADER

DEVICE NAME? SYS or SYS: or DSK or RKB1 or RXA1: etc.
DEVICE LENGTH? 737 or 3248 or 494 or 988 etc. (total)

if the device contains a system area the following applies:
SYSTEM ID? OS/8, OS/12, OS/78, DS/8, or PS/8
VERSION NO.?  3 or whatever
RELEASE CODE? C or D or ......
if there is no system area the questions above are skipped

LOGICAL DEVICE NAME? CHEM or BOB: or LDF or 1234 (1-4 chars)
VOLUME NO.? 1 or any number up to 4095; 0 = none
DESCRIPTIVE LABEL:
Here you may enter any identifying information (UPPER/lower
case, as you wish) - up to 128 characters, including CR/LF.
Terminate input with a CTRL/Z.  Rubout, linefeed and CTRL/U
work in their normal OS/8 fashion.  End input with a CTRL/Z

*L Q (or type CTRL/C)

.R DIRECT  or DIR DEV:/H
*DEV:/H$
This will list the header information you have just written.