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Message: [QUOTE="sathya, post: 1546668, member: 20537"] I see now that downloading 10.12.4 (4.95 gB) is possible when I sign out of the App Store.. However I want to download to a thumb drive which is listed. When I click on it I get the following message: "This disk doesn’t use the GUID Partition table scheme. Use Disk Utility to change the partition scheme. Select the device containing the disk, click the Erase button, select the volume scheme, and then click Erase." What I don't get here is how to "select the volume scheme" and why it directs one to click erase twice. [/QUOTE]