Safe Mode: If you boot into Safe Mode by holding Shift at startup, the system will perform a file system consistency check using the "fsck_hfs" tool. As a result, the following scenarios end up doing the same thing: When you use either fsck or Disk Utility for checking the boot drive on a Mac, both tools will first check the drive's format and then run the verification and repair using the "fsck_hfs" tool which is specific for the HFS and HFS+ file systems. The quick answer is "absolutely nothing." The question that has been brought up is, what is the difference between these methods? There are several common ways to do this, which include booting to Safe Mode, Booting to Single User mode and running "fsck," or booting to the installation DVD and running Disk Utility. When a Mac either has problems booting, is experiencing slowdowns, or has just recovered from a crash or power outage it's good to at least verify that the file system structure has not been compromised. One question that has been brought up recently is which disk-checking practice is best when performing maintenance on your system.
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