Mac Disk Repair: How FSCK Repair Works

Mac Disk Repair: How FSCK Repair Works
In some cases of start up problems you can't use the Mac disk repair utility; instead you will have to go for the fsck. Fsck is another way to repair start up problems on Mac computers. Here is how it works.
You must first run fsck from the command line. In order to do that, you have to start up the computer using the single user mode. This will be the way for you to reach the command line. Since the trouble is starting up your computer you can have a forced restart to be able to go through the process. Then if you reached the command line type this in: /sbin/fsck -fy.
After that press enter and it will go through 5 phases looking for file errors. If the phases are successful it will display: ***** FILE SYSTEM WAS MODIFIED *****.
If it did not find anything wrong it will display this: ** The volume (name of volume) appears to be OK. If this shows up type in: REBOOT.
After that the computer will start up and it will be okay.

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