The sd card comes with my HDH was somehow damaged. It cannot be accessed by the phone nor from the card reader of my PC. I am going to replace it. Please help me with these: 1. I have a 8GB class4 SD card, is class4 fine for HDH? 2. Since the original card is not accessible so I have NO way to copy the content to the new card. Will my HDH work normally without the original (factory installed) things in the new card? Will this affecting the functions of the phone? Thank you very much !!