This is a very wierd problem, i really dont understand what is wrong with my 16GB Class 4 SanDisk Memory Card. The data on my memory card has stuck, Niether I can delete it nor i can add, copy, paste anything into it.. But I can copy the data in it to my PC.. I tried to format it with my android phone Dell Venue (Cyanogen Mod 7.2) but no use.. I tried to format it through the recovery still no use... When i format it in my PC it shows format is complete and when i open the memory card in my PC it appears empty, but as soon as i stick the mem card back into my phone the data appears again... The 7.7GB in my mem card are used and i cant delete it... I tried different softwares like SDFormat for formatting my mem card bt all in vain.. I used Command prompt to format it took around 20 mins to format but still the data was back.. Im frustated because i cant find any solution to it.. Please help me out.. !!!