FAT32 is an open standard AFAIK, however it's extensions (eg long file names) and forks (eg exFAT) are patented. But in fairness, FAT32 isn't much use without s

FAT32 is an open standard AFAIK, however it's extensions (eg long file names) and forks (eg exFAT) are patented. But in fairness, FAT32 isn't much use without support for long file names. Interestingly, some FAT32 forks do support journalling. Sadly those tend to be the patents Microsoft are the most proactive in upholding. As for an alternative, ZFS is supported on FreeBSD, Linux, Solaris and OS X - so that's one option. Albeit it's not a great option in this specific criteria. ext2 receives pretty good support as well, even on Windows. However ext2 doesn't support journalling. Another option is to run ext3 as that gracefully downgrades to ext2 if no ext3 driver is available. Sadly NTFS is probably the most ubiquitous journalling file system. ntfs-3g - which are actually pretty decent drivers - has been ported to quite a few platforms.