Sony Vaio PCG-FX501 Instruction & Operation Manual page 57

Using your notebook
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Write-protecting a Memory Stick™
Memory Sticks™ are designed with an erasure prevention switch to protect valuable data from accidental erasure or
overwriting.
Move the tab to the right or left to set or release write-protection. When the erasure prevention switch is off, data can
be saved on the Memory Stick™. When the erasure prevention switch is on, data can be read from but not saved on
the Memory Stick™.
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