1. Using 6.7, the *installer* defaults to ffs2 for new filesystems for almost all platforms. 2. Using 6.7, a newfs "by hand" still gets you ffs1, unless you use the -O2 flag or the partition > 1TB. 3. In -current, newfs defaults to ffs2 for all platforms. 4. ffs2 is faster than ffs2 when creating filesystems and almost always when fscking them. 5. ffs2 uses 64-bit timestamps and block numbers. So it handles dates after 2038 and much larger partitions. This does not mean that super large partitions are always a good idea, there are still drawbacks: e.g. they do need lots of memory to fsck, especially when many inodes are in use. 6. I have no plans for writing a conversion tool. You can convert an ffs1 filesystem to ffs2 using single user mode: umount; dump; newfs -O2; restore; mount. Or see it as an opportunity to reinstall and get a nice clean system without cruft collected over the years.