HP C100/110 - Manual (Page 86)

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Using Your Digital Data Storage (DDS) Tape Drive
DDS Tape Drive and Data Cassette Descriptions
Figure 16 Setting the Write-Protect Tab on a DDS Tape
To protect information on a data cassette from being overwritten, set the
write-protect tab to the write-protect position, as shown in Figure 16.
NOTICE: The write-protect tab should always be in the write position for transferring
data to a cassette.
Push tab right
for write.
Push tab
left for
write-protect.