Dell Inspiron 11 (3147, Mid 2014) - Manual (Page 34)

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ExpressCards
The following figure shows the size-comparison of ExpressCards:
54 mm ExpressCard (EC 54) 34 mm ExpressCard (EC 34)
Types of ExpressCards Features
ExpressCard/34 • Used in smaller computers
and supports limited peripherals
• Can be used on both EC 34 and EC 54
slots
ExpressCard/54 • Supports a wide range of peripheral
devices
• Consumes more power than the
34 mm cards
• Can be used only on computers that
support EC 54 slots