Your partitions will be created, this may take a few minutes.
Create A Boot Usb Drive Sierra How To Partition USBGuide 6 How To Partition USB Drive macOS High Sierra by Admin.Problem is, most USB keys and external hard drives come formatted for Microsoft Windows and have whats called a Master Boot Record.By default, you cant view the options to enable you to change this in macOSs Disk Utility to be able to change it to the standard GUID partition: this is what allows you to create partitions on a USB drive or external hard drive.
Typically the Partition button will be greyed out, and on hover the following message will be displayed: Disks with master boot record cannot be partitioned. Fear not, however, for we have found the solution: In Disk Utility, Select View and tick Show All Devices. ![]() Create A Boot Usb Drive Sierra How To Partition AFollow along for the full guide on how to partition a USB drive in macOS High Sierra. Partition USB Drive macOS High Sierra Things you will need: A Macintosh computer running macOS High Sierra (10.13) or higher. A USB key (any size GB is fine) OR an external hard drive (USB or otherwise, any size GB will work). WARNING: This process will have you format the USB drive or external hard drive, which means youll lose all existing information on that drive. Triple-check that theres no data on the drive that you want to save, if there is, you will have to move it somewhere else before you continue. Youve been warned. Part 1: Prepare USB Drive If your drive is already formatted as GUID Partition Map and you can see containers in the sidebar, you can skip to Part 2: Partition USB Drive. Press CMD Spacebar to search for it or go to Applications Utilities Disk Utility in Finder. In the upper left corner of Disk Utility, select View ( A ) and tick the option Show All Volumes. Your sidebar should now show a parent field for your USB drive or external hard drive. ![]() In the window that pops up, for Scheme select GUID Partition Map ( D ). Name: You may give your drive a new name (this is how it will be shown in your computer later on. Format: if you need the drive to work on both Macs and PCs, select ExFAT. Part 2: Partition USB drive macOS High Sierra If your USB drive is formatted as GUID Partition Map, the Partition button should now no longer be greyed out. Select your drive in the sidebar ( A ) and click Partition ( B ). In the window that opens, use the and - buttons in the lower left corner ( C ) to add and remove partitions. Give each partition you want to add a name ( D ) and set its size in GB (Gigabytes) ( E ). You can also drag the dots around the circle representing your drive to change the size of each partition. When youre happy, click Apply ( F ) and then Partition in the popup window.
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