Unfortunately, yes. You will lose all data you have stored on your sdcard. Most software I have messed with has an ability to backup your data before you format, so you may be able to save your pics and vids. My phone usually runs between 96 and 108 degrees. Occasionally it reaches temps upwards of 125 degrees. I am runing at 1.1 Ghz almost all the time. I have read a some info on this and I have found that that the range for our chips goes up to 180 degrees Fahrenheit. so I have not been concerned with my usual readings. The only way I could get an adapter was to buy one with another micro sdcard. So i purchased one from Walmart for $12 with a 2G card.