I highly recommend adding one step before using the command quadriceps gave to partition the USB.

What Partition Map Boot Usb Mac OS Extended

I tried MS-DOS (FAT) with 2 partitions tried the Mac OS Extended (Journaled) and GUID Partition map for my 32 GB thumb drive.

Then when i get to the partitioning step I select MS-DOS(FAT) for each partition but no luck.

In the Mac OS disk utility program selecting MS-DOS(FAT) formats the drive to FAT(32).

If you cant format it at all I click on the first aid tab and run repair disk on it.

I forgot to mention that some USB drives dont allow partitioning.

If in the partitioning tab the MS-DOS FAT is grayed out your drive may not be partitionable.

Try using the erase tab, set up a single partition and see if that works first.

Current version is 5.2.2, I think.

It has the advantage of being able to partition on the fly I.e.

I have found it woks well with SSDs as well as spinning discs or with Mac GUID SanDisk 128gb thumb flash drives.

I havent tried yet to reformat my 64gb Fat32 SanDisk micro thumb drive that I use for CDs.

You need to set the partition map to Master Boot Record, and then choose FAT 32 formatting.

It needs to be Master Boot record for Partition map not GUID.

I had the same failures but was successful using diskutil in terminal.

What Partition Map Boot Usb Trial And Error

Solved: After MUCH trial and error, with yalls help, this worked for me on Mojave: 1.

Open Terminal and type: diskutil partitionDisk devdisk2 2 GPT ExFAT Volume1 50 ExFAT Volume2 R 2.

Show all devices Then I had a partition that would not mount.

Erase disk2s3 with the ExFAT format BOOM, it worked.Sheeeeeesh Hope I am able to save some folks some time and stress.

Thank you so much My 5 steps ended up not showing up in my car today.

Heres a related question: All my music, at this point, is in iTunes, some of which Ive add via CDs or purchases over the years, a lot of which Ive downloaded from Apple Music.

I can see how to copy files over that have an M4A extension, but what about everything else Suggestions greatly appreciated.

Fastest deletes the index to the files but leaves the files untouched.

Ok, I tried everything listed above on my Sandisk Ultra 3.0 128gb.

Nothing worked Disk Genius does not support the drive.

The terminal says You cannot manually partition an existing APFS Container disk The Disk Utility will not allow me to select partition.

What Partition Map For Mac Boot Usb