Sony PCV-RX501 User Manual page 41

Using your VAIO desktop
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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™.
LOCK
LOCK LOCK
* The 128 MB Memory Stick™ has a vertical lock.