Go to Home screen ==> Menu ==> Settings ==> Menu ==> Device Info
Quote:
Device Info
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Wi-Fi MAC Address: xx:xx:xx:xx:xx:xx
Serial Number: xxxx xxxx xxxx xxxx
Network Capability: Wi-Fi
Firmware Version: Kindle 5.3.7 (2004410010)
Space Available: 1,590 MB Free
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Depending on your device, you will only have a certain amount of total memory, ~1-3 GB. You can also get more confirmation using your File Browser when tethered.