Shoud I Root My Android Phone to Write/Read From SD Card?

Yesterday, I tried to make some simple apps which can download xml files from website, and put them on /mnt/sdcard/ . And fortunately, I succeeded in doing it. However, just a moment ago, I wondered if it works just because my phone is rooted. So I wonder if it works on un-rooted android phones? And thank you, I found the answer : It will work both rooted an un-rooted phone. It wont be any problem. :)
Thank you, but it didn't answer my question. My phone is rooted already. So, did it work because I root my phone, what if I install it on un-rooted phone. will it work ?

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