Hi there, dansk12345,
Double-click Disk Utility. On the left side of the window are the drives connected to the computer. Select the capacity of the drive respective to the one containing the device you wish to format then click the Erasetab. Format the Flash Drive Click Go on the Finder menu and choose Applications from the drop-down. Now, go to Utilities and open Disk Utility. Choose the drive by clicking on its name in the External section (located on the left panel of Disk Utility). Click the Erase button (or tab) on the top bar. Best free data recovery software for Windows & Mac: I am not responsible for any data loss, I did say make sure you have every.
Thanks for using the Apple Support Communities. From your post, I understand that you are trying to set up a GPT (GUID Partition Table) with your flash drive. I'm happy to help!Format Flash Drive On Mac For Windows
The 'Make sure that your storage device is properly formatted' section of the How to set up and use an external Mac startup disk
Format A Disk
article provides the following instructions on setting up GPT:Make sure that your storage device is properly formatted
For best results, your external hard drive, thumb drive, SDHC or SDXC card, or other storage device should be formatted as Mac OS Extended, not FAT, ExFAT, or NTFS. And to function as a startup disk, it needs to be using a GUID partition map. Here's how to check:
- Connect your external storage device to your Mac.
- Choose Apple menu () > About This Mac, then click the System Report button. Or hold down the Option key and choose Apple menu > System Information.
- Select Storage from the sidebar, then select your storage device from the list of volumes. Make sure that the Partition Map Type shown for your storage device is GPT (GUID Partition Table):
If your storage device isn't using a GUID partition map, you can follow these steps to create one with Disk Utility.This deletes all of the data stored on your device.
- If you're using OS X El Capitan or later, select your external storage device in Disk Utility. (Select the disk name, not the volume name indented beneath it.) Then click Erase and choose the GUID partition map scheme and any Mac OS Extended format before erasing.
- If you're using OS X Yosemite or earlier, select your external storage device in Disk Utility. (Select the disk name, not the volume name indented beneath it.) Click the Partition tab, select your partition, then click the Options button. Select GUID Partition Table before partitioning.
Have a great day!
Aug 27, 2017 4:38 PM