Had the Time Capsule a little while now, I always connect another HD into it to expand the 500GB internal, the following I have tried: WD 320GB portable HD (MS-DOS Fat 32) works WD 1TB Desktop HD (MS-DOS Fat 32) works IOMEGA 1.5TB Desktop HD (MS-DOS Fat 32) doesn't work! Is the hard drive size too big? Or some other issue? It was originally NTFS, but formatted as FAT32 via disk utility to work with Windows and Mac. Any reason why this might not work or firmware issue which Apple needs a suggestion to fix?