HEIDENHAIN MANUALplus 620 Technical Manual page 1536

8.5.2 Data organization on the hard disk
TNC partition
PLC partition
SYS partition
Assignment to
drives
1536
There are three different drives (partitions):
User-specific data such as NC programs, tool tables, and datum tables.
Your OEM-specific data such as system files, PLC programs, machine
parameters, help files, PLC dialogs, PLC error tables, compensation value
tables and OEM cycles. The PLC partition is visible only after you have entered
the code number 807667.
As a machine tool builder, you are concerned primarily with the PLC partition.
Note
Define all your machine-specific settings with the configuration editor!
For HEIDENHAIN
System-specific files, such as system files, NC dialogs, HEIDENHAIN cycles,
etc.
The partition SYS can neither be viewed nor selected.
Warning
Alterations to the system partition can impair proper function of the control!
Partition Contents
SYS System files
PLC OEM files
TNC User files
Hardware code
"R" drive
"O" drive
"V" drive
HEIDENHAIN Technical Manual MANUALplus 620