Dell Inspiron 15 (3521, Late 2012) - Manual (Page 4)

1 USB 2.0 port (supports Windows debugging)
Connect peripherals such as storage devices, printers,
and so on. Provides data transfer speeds up to
480 Mbps.
This USB port can be used for Windows debugging.
2 Optical drive
Reads from and writes to CDs and DVDs.
3 Security-cable slot
Connect a security cable to prevent unauthorized
movement of your computer.
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