How to root my s5 and not to void my warranty

hi i have been having trouble putting files on my 64 gigabyte sd card on my galaxy s5 everyone is saying i have to root my galaxy there are many ways of rooting the galaxy can anyone suggest a safeway of rooting my galaxy without voiding the warranty appreciate any help thank you. ps or does anyone know of a program to use without routing so i can write to my sd card

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