Difference between GUILD Partition Map & Apple Partition Map
I’m formatting MacBook Pro 2010im making a USB drive to download high Sierra, the USB had windows 10 on it,
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Joseph_S.
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Community Specialist
Hi Smithcraig070,
It sounds like you have some questions on creating a bootable installer for macOS, and I want to help.
If this will be a bootable installer for High Sierra, you'll want to follow the steps here:
How to create a bootable installer for macOS - Apple Support
To answer your question on GUID Partition Map or Master Boot Record, you would use GUID Partition Map for drives used on all Intel-based Mac computers.
Disk Utility for macOS Sierra: Partition a physical disk using Disk Utility
I hope that helps.
Thanks for using the Apple Support Communities.