Joe Petruchi wrote:
> If you have rooted your phone, it should work, but it will only work on
> that phone. ??
>  
> I donot understand this ??

*blink, blink*

You know chmod 777 but you do not know what root is?

> Please explain

To execute any command in a Linux environment, you need to have
permissions to run the command.

You do not have permissions to run chmod 777 /data.

If you had root access to your phone, you would have permissions to run
chmod 777 /data.

However, the T-Mobile G1 does not ship with root access enabled.

Hence, there is a process, colloquially called "rooting your phone",
that (presumably) gives you root access. I haven't done it, as I don't
have the need to do it.

So, if your goal is to run chmod 777 /data on your own phone, you'll
need to root it:

http://android-dls.com/wiki/index.php?title=Main_Page#Dream.2FG1.2FADP1

If your goal is to be able to run chmod 777 /data on all Android
devices, you can't.

-- 
Mark Murphy (a Commons Guy)
http://commonsware.com | http://twitter.com/commonsguy

Android App Developer Training: http://commonsware.com/training.html

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