content: I recently had a 4 year old SD card suddenly get corrupted to the point where my phone could not even reformat it. I replaced it with a larger, more reliable one for about $25.00, but I would not use even the new one as the primary storage for anything. My phone’s app data is all cached data stored elsewhere. Any photos or videos I take with it are copied off of it once I get home. Any files I put on it are only copies to have with me while I’m out.