The cost of LBA48 support is very small and it means that upgraded drives/CF cards which are over 128GiB will just work with no custom build required. There should be no runtime effect on disks which do not require it.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25553 a1c6a512-1295-4272-9138-f99709370657