Hello all. I would also like to get an external HDD for the MBA. The WD Passport at Amazon looks really good. One cable, USB 3.0, all good specs. My biggest problem is it appears that Mac OS X only supports the following file systems for an HDD of that size: FAT32 HFS+ The first is OK, except for the fact FAT32 can't support files over 4GB in size. Second, OS X does not support EXT2/3/4 or NTFS from a read/write standpoint. I would like this HDD to be able to work with Mac OS, Linux, and Windows for file storage. Thanks.