Disk Management error 5
running first aid yields DiskManagement error 5; assume I need to reformat?
iMac 27″, macOS 10.13
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You can try that, but If the error code 5 is hardware-related, the only real hardware-based fix you can do for your Mac is to reset the Parameter RAM (PRAM) or/and system management controller (SMC). ... Before resetting PRAM or SMC, you should back up your data or even the whole system on an external drive as a precaution.