So you might have seen that your disk utility reports ILLEGAL NAME in red and cannot fix it. Usual mac enthusiastic tip is to do reinstall. O behold, here’s how to fix it easily.

1) Boot to single user mode by pressing command+S at reboot until you seen black screen

2) when white cursors block appears after lots of text, type “fsck -f

Wait until it does the repairs. DO NOT be alarmed if your computer fans start howling like vacuum cleaner. The repair process could take even 10-30mins at older macs.

3) once the white block returns or successful completion announcement comes, press enter (if there is no white cursor block”)

4) type “reboot

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