External Flashdrive Won't Mount on Mac I formatted it as a boot drive, and it worked. But now, my Mac reads it as only being 2.4 MB rather than 124 GB, but it recognizes that the drive is 124 GB when trying to partition, although I can't partition, since the drive won't mount in the first place.
I put the flash drive in a computer running Windows 10. I discovered it had an EFI disk partition after seeing the EFI folder through File Explorer, and I realized that that was the thing that was not allowing the drive to work on my Mac. I was unable to delete that partition through Disk Management, since Disk Management won't allow you to modify or delete EFI disk partitions, so I had to use Diskpart. I right clicked the Command Prompt to run it as an administrator. Once it opened, I typed in diskpart, and hit enter. I looked over at the Disk Management tab to see which disk it was. I then typed in select disk 1, and hit enter. After that, I typed in list disk, and hit enter to make sure I selected the right disk, since there's an asterisk to the left of the selected disk. Once I saw I selected the correct disk, I typed in clear, and hit enter. It didn't work the first time, so I waited a minute, and typed in clear again, and it worked the second time. I then went into Disk Management, and initialized the drive as an exFAT drive, since NTFS doesn't work on Mac without some sort of special program. It now works perfectly fine on my Mac.