Dell Inspiron 1521 (Mid 2007) - Manual (Page 80)

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Using ExpressCards
Remove the blank before installing an ExpressCard. To remove the blank, see
"Removing an ExpressCard or Blank" on page 81.
Installing an ExpressCard
You can install an ExpressCard while the computer is running. The computer
automatically detects the card.
ExpressCards are generally marked with a symbol (such as a triangle or an
arrow) or a label to indicate which end to insert into the slot. The cards are
keyed to prevent incorrect insertion. If card orientation is not clear, see the
documentation that came with the card.
CAUTION:
Before you begin any of the procedures in this section, follow the
safety instructions in the Product Information Guide.
To install an ExpressCard:
1 Hold the card with the top side of the card facing up.
2 Slide the card into the slot until the card is completely seated in its
connector.
If you encounter too much resistance, do not force the card. Check the
card orientation and try again.
1 slot 2 ExpressCard
1 2