trying to erase data from old Mac, cannot access the erase tab under disk utility. help
trying to erase data from old Mac 2017, cannot access the erase tab under disk utility. help
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If you are trying to erase a volume in Disk Utility but can't, it's likely that you're trying to alter your startup drive. That is disallowed.
You'll have to startup in Recovery mode to do that.
How to reinstall macOS - Apple Support:
https://support.apple.com/en-us/HT204904