I got an external hard drive tonight exclusively for use with backing up my photos (particularly RAW files). It's formatted right from the box as being ready for OS X, unlike some hard drives that are formatted for Windows. I know Windows can't read it as it is right now, and so my question is whether I should reformat it in FAT32 so both Windows and Mac can read it, or whether I should leave it alone. Is there a speed difference on OS X if it's formatted a certain way?