DEC 4000 Model 200 Operation Manual page 74

• Write-protect the cartridge by using operating system commands
described in your system software manuals.
Your system can read information on the tape regardless of the position of
the write-protect switch or whether writing is software-disabled. However,
the system cannot write data to the tape when the write-protect switch is
set to the write-protect position, or when writing is software disabled.
When you use a cartridge to install software, make sure the cartridge is
write-protected. Two icons on the switch indicate the write-protect status,
as shown in Figure 3–10. An orange rectangle is visible when the switch
is in the write-protect position. If you do not see an orange rectangle, slide
the switch toward the label slot.
When you insert a write-protected cartridge into the drive, the orange
indicator light comes on. The system recognizes the tape as being write-
protected under any one of the following conditions:
• The write-protect switch on the cartridge is set to the write-protect
position.
• An operating system command has write-protected the tape.
• A tape recorded on a TK50 tape drive is inserted into the drive.
Removing write-protection depends on how the tape was recorded and
how it is write protected. You cannot write-enable a tape recorded on a
TK50 tape drive either by moving the write-protect switch on the cartridge
or by using software commands. The TK70 drive always recognizes a
tape recorded on a TK50 drive as write-protected. You can remove write-
protection on tapes recorded on a TK70 drive as follows:
• If the cartridge is write protected only by the write-protect switch on
the cartridge and not the operating system, moving the switch to the
write-enabled position causes the orange light to go out at the end of
the executing command.
3–22 VAX 4000 Model 200 (BA430) Operation