If you want to erase all of your data from your Nexus One including your Google account, downloaded applications, system and applications settings then Android 2.1 provides you with the option to restore all of your factory settings easily. Its just like doing a wiping your data partition completely. It will not erase SD card files like music or photos, your current system software and bundled applications.

How To Restore Factory Settings In Nexus One
To hard reset your Nexus One, follow the steps below:
- From the menu, go to Settings
- Then go to Privacy
- Select Factory data reset and read the warning carefully.
- When you’re ready, press the Reset phone button.

Thats it! Now your Nexus One will be just like as if you have bought a new one!
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