I bought this PATRIOT 16G CLASS 4 MICROSDHC ,,,worked for a week. This morning my phone ran out of battery so i charged it. After fully charged 50% of my apps showing "loading" clicked on it ,it says not intalled. Checked settings ,sd card and phone storage, sd card not showing. Removed sd card put it on my pc all files are there. hmmm..so i copied all the files on my desktop. Tried formatting the patriot sd card it saying write protected so I cant format it and yes the tab is not on locked position and I used a thumb drive adapter too. So I grabbed my blank Sandisk 8g sd mini sd card transfered all the files from my desktop and it works. Now im going back to frys and try to get a refund.Just my experienced on this mini sd card I`d like to share.:-\