So why does the A500's internal storage memory show up as "sdcard"? Since I have rooted this tablet, I use Root Explorer, which I have run on 2 rooted Android phones before I got this tablet. In the A500, I see a folder in the root of the memory named 'sdcard', which is NOT my installed 16GB SD card.
By digging around and from a forum post somewhere, I learned the actual external SD card is in /mnt/external_sd. BUT..... in /mnt there is ALSO ANOTHER folder listed as "sdcard"?? It appears to actually 'mirror' the same content that /sdcard holds. Is it just some kind of link, like when Microsoft made the Windows 7 Users/Username/Application Data shortcut which is the only way to get into the actual AppData folder? I wouldn't think they would have dual copies of those folders within the internal memory.
This gets rather confusing when you have a file on your SD card and you are trying to access it from some application in the tablet.