Dell Precision 3640 Tower - SD card-optional

3. Follow the procedure in After Working Inside Your Computer.
SD card—optional
SD card is an optional component. You will see a SD card only in systems shipped with a WWAN card.
Removing the SD card
Steps
1. Follow the procedure in Before Working Inside Your Computer.
2. Pull the SD card out of the system.
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Disassembly and reassembly