I have a Droid X with a sandisk 16gb micro sdhc class 4 installed. This card has been in use for about a year and wasnt even half full. I was playing music on thanksgiving and all of a sudden the music stopped. I thought hmm, It must be doing one of its many reboots. It wasnt shut off but was on my home screen and the music player had closed. I went to my music and the songs were still listed. I tried to play one and got the error message that i cannot play this file. I tried again and the songs disappeared and up came "SD Card blank or has unsupported file system" on the top bar. I tried to view files on the card on my phone and on my computer by using an sd adapter with no luck. I popped another card into my phone and it worked with no error message and i could mount and unmount the card and view the picture I took when viewing the new card on my computer. I have a 9 year old daughter who suffers from multiple chronic illnesses and have probably 200 photos on my card of her including an extensive surgery and recovery earlier this year. If a professional can retrieve my photos, I would like to know more. Im coming up on my contracts end and this has me ready to zip up a life vest and get on another boat altogether. I have seen hundreds post about this on boards but I hope this can be resolved. Thanks in advance.