Using your notebook
Using PC Cards
Sony Notebook User Guide
n N 41 
Using PC Cards
Your computer includes two PC Card slots. PC Cards allow you to connect portable external devices.
To insert a PC Card
Use the lower slot for PC type III Cards.
RELEASE button
!Some devices may not function properly if you repeat Returning to Normal Mode from System Suspend Mode or System Hibernation mode.
!The computer will return to its original state if you restart it.