AFAIK, NTFS implements journaling with a logging fs:
they implemented 2 filesystems: the actual NTFS, and a logging fs
(called LFS) which is stored in a fixed size file on the volume.
I guess that the LFS is only written (and read during fsck).
The wraparound is a huge problem: you might recall the one of the tweaks
which Mindcraft did on NT was:
'set the size of the log to a incredibly large number' (65 MB).
(the default should be somewhere around 4 MB, but the system gets
nearly stopped if the log overflows)
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