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enter image description here I have a 15” Intel Macbook Pro(mid 2015) on High Sierra. No operation issues with laptop, but one day I ran First Aid and got the error that a volume in Macintosh HD could not be unmounted so the repair failed. I ran it again in Recovery Mode and the Macintosh HD was able to be unmounted. As I went down checking the rest, this warning appeared while checking a container: Overallocation Detected on Main Device:(42686064+1) bitmap address (e4ef). See screenshot. How can I fix this? Or should I let it go? I have seen a similar question but not sure if it applies.

Any help would be appreciated. Thank you.

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  • Why were you running First Aid on a Mac with “no operation issues?”
    – Allan
    Commented Mar 21 at 16:30
  • I just wanted to check if anything was wrong that was not showing up. Sort of preventative maintenance.
    – Kansuke
    Commented Mar 21 at 16:43
  • Unless you’re experiencing a genuine issue, you shouldn’t be running First Aid
    – Allan
    Commented Mar 21 at 16:51
  • Then, I assume, there is not a serious problem with my laptop. Its old.
    – Kansuke
    Commented Mar 21 at 17:01
  • No issue at all.
    – Allan
    Commented Mar 21 at 17:21

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