Sony VGN-AW190NAB - Manual (Page 78)

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Using Your VAIO Computer
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Insert the CF (CompactFlash) memory card slot protector to block any particles from entering the slot when not using an CF memory card. Before
moving your computer, be sure to insert the CF (CompactFlash) memory card slot protector into the slot.
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If the memory card does not go into the slot easily, remove it gently and verify you are inserting it in the proper direction.