How to format AF Hard Disk on XP? (external storage only) in Home Storage and Computer Hardware Posted August 19, 2016 · Report reply Hi guys, I bought a 2TB WD2003FZEX, it is AF (advanced format), I have only Win XP SP2, I put the HD in External Enclosure, and I intend to use this HD for external storage only with 1 partition, I will not install any OS on this HD. All is ready now to initialize and format the HD for the first time, but I have never formatted an AF HD before. Because it will be used for external storage only, should I format the HD normally to NTFS allocation size default 4KB? Or I need to do something else? Thanks in advance.