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- Feb 19, 2012
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i want to create a system disk on a 64 gig flash when i run install os high sierra app and chose the usb dive it it is greyed out. if i click on it it tells me it doesnt use the GUID partition scheme, referes me to disk utility which doesnt let me set up a GUID partition scheme. Help! I don't want to create a installer disk but a system disk