This procedure will take a few minutes to complete. The machine may freeze up, or lock up during this procedure.

Patience is key here.

Disk repair may fail, or give an error message. Restart your machine and run it again if this is the case, it may repair further issues.

Once completed, click done.

Pro Tip: To see the entire process including corrected errors, click on the arrow next to 'Show Details'.

Repeat this on all items in the Disk Utility list for your internal drive. Move upward through the list. Order of operations is all volumes first, then the container and finally the disk itself.