Sony Ipela PCS-XG80 Operating Instructions Manual page 186

Symptom
Still pictures or the
Phone Book cannot
be saved to the
"Memory Stick."
186
Troubleshooting
Cause
The write-protect tab on the
"Memory Stick" is set to LOCK.
The "Memory Stick" has already
been recorded to full capacity.
Solution
Release the lock (page 197).
Use another "Memory Stick."