Sony PCG-GR300 Manual

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Using PC Cards 
Your notebook includes two PC Card slots. PC Cards enable you to connect portable external devices such as another hard
disk drive or a PC Network Interface Card (NIC) to connect to a network. 
  Note: 
 
The PC Card slots can accommodate two Type I/II PC Cards, or one Type III PC Card. These slots are compatible with
CardBus. Use the lower slot for Type III PC Cards. You do not need to shut down your notebook before inserting or
removing a PC Card. 
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