I'm using sony ericsson xperia Ray ST18i android phone. It is given in the specification that the maximum expandable memmory is 32 GB. My doubt is that If I use 32 GB Sd card, will it affect the performance of the phone. Is it the best practise to use always a SD card of capacity lower than maximum specified. If I can use 32 GB without any adverse effect on the performance of the phone then which class and brand of SD card is suitable for it. Is there any performance based problems on using other branded sd card on the sony ericsson Xperia android phone instead of using the sony brand.