Apple today issued the Macbook, MacBook Pro Software Update 1.0, which fixes a little-known feature that was not enabled on some of these portable Macs. Today’s Macs use “file system journaling” by default. As Apple says:
Journaling is recommended for all Macintosh computers as a preventative measure against file corruption.
What journaling does is keep a record of everything your hard disk does, so if you have a crash, the journal can update your disk’s catalog when you restart. You can check whether journaling is enabled for your hard disks by running Disk Utility, selecting a disk, then checking at the bottom of the window in the section that provides disk information. If your MacBook or MacBook Pro does not have journaling enabled, follow the instructions in the Apple technical article linked above to repair the disk and make sure the journal updates correctly.
In the meantime, check the Software Update preference pane to download this update, if you have a MacBook or MacBook Pro.
