8 secure digital (sd) card, 9 base cover, 10 hard drive – Dell Latitude E6420 ATG (Early 2011) User Manual
Page 4: 11 optical drive, 13 wireless local area network (wlan) card, 14 wireless wide area network (wwan) card, 15 coin-cell battery

Installing the Subscriber Identity Module (SIM) Card
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Removing the Secure Digital (SD) Card
..........................................................................25
Installing the Secure Digital (SD) Card
............................................................................25
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13 Wireless Local Area Network (WLAN) Card.....................................37
Removing the Wireless Local Area Network (WLAN) Card
............................................37
Installing the Wireless Local Area Network (WLAN) Card
.............................................39
14 Wireless Wide Area Network (WWAN) Card...................................41
Removing the Wireless Wide Area Network (WWAN) Card
..........................................41
Installing the Wireless Wide Area Network (WWAN) Card
...........................................43
Removing the Coin-Cell Battery
......................................................................................45
Installing the Coin-Cell Battery
.......................................................................................46