I'm planning on buying an external hard drive soon. I browsed through the forums and I saw a couple threads discussion about external HDs. My question is, is there an external HD that you can read/write on a Mac AND a PC? I know formatting to FAT32 is one way of doing it, but I was just wondering if there are any HDs out there that doesn't need formatting for you to be able to read/write on a Mac and a PC. Thanks!