i know this is a old discussion, but i have a JXD S7800A and recently got a JXD S7800B...i was told it was the 16GB...when i looked at the storage i noticed i only had .09gb left and there was a SD card with another 8GB...So the unit itself is only 8GB it seems...i wonder if the guy sold me another S7800A...Also how can i really tell if i have a S7800B..i got off ebay and he showed a photo of recp't showing S7800B..is there any way to know for sure? Please help...