HT202731: Using Apple Diagnostics
Learn about Using Apple Diagnostics
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Helpful answers
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Jul 29, 2015 3:44 AM in response to Geoff Redwoodby OGELTHORPE,Download from the Internet OmniDiskSweeper and Grand Perspective (both free) and open them. They will show all of your files and the respective sizes. Transfer to an external HDD or delete those files you do not want on your boot HDD.
Ciao.