I currently have an unlocked bootloader with the intention to root and flash roms. I am wondering how flashing roms will affect the sdcard? Is that portion actually treated like an sd card (unaffected by flashing a rom), or will it be erased when I clear everything before flashing a rom? I'm used to the D1 that actually has an sd card, so I know nothing on there would be lost (pics, music, etc). Thanks in advance for any feedback.