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In Settings -> Privacy -> Factory data reset?

I don't mind giving it away rooted, but if it wipes out the Superuser application (hence allowing any app to enter root mode unchecked) would be very very bad.

If it erases that app while leaving it rooted, can I just re-download the .apk and reinstall it afterwards? Or does that procedure unroot the phone? That would be OK too.

It's a Milestone 1 with Motorola's official 2.2 update. I just rooted it so I could use the ClockSync and Screenshot apps.

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up vote 5 down vote accepted

Depending on the device (and root method), the su binary (which gives your device root) is usually located in /system/xbin/ or /system/bin/ directory, while the Superuser.apk (which acts as a gate keeper, presenting you with a dialog when apps request root permissions) is always in /system/app/. The /system partition does not get cleared by the Factory Reset process, so it's safe to perform while still retaining root.

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Good to know, but what about the Superuser apk that asks the user to allow access by apps? Does that stay in place too? –  JCCyC Mar 23 '12 at 19:33
    
Edited my answer with clarification about Superuser.apk. –  Chahk Mar 23 '12 at 19:33
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