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like the title says, I have one mac that mounts the EFI partition on my external hard drive, and another that does not. I'm not sure how the EFI started showing up on the one mac, but I'd like it to not mount when I attach my external hard drive, regardless of the computer.

Thanks for any help in advance!

EDIT

this is all on the offending computer (2018 MacBook Pro):

  • current OS is Mojave 10.14.5, though this has happened through all of Mojave.
  • mount does not happen on boot.
  • these hard drives are attached to an external cinema display. If you eject the partitions then restart, the partitions do not show up. However if you eject the drives, then unplug the display from the computer and plug it back in, they show up immediately.
  • one is attached via lightning cable, another by USB.
  • even if you plug them directly into the computer (usb-c with adapters), EFI shows up.
  • there is maybe a 3-month difference in the ages of the computers. The computer for which the EFIs do not show up has the same specs as the offending computer.

DISKUTIL OUTPUT FOR PROBLEM DISKS

/dev/disk2 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk2
   1:                        EFI EFI                     209.7 MB   disk2s1
   2:                  Apple_HFS G-DRIVE                 999.9 GB   disk2s2

/dev/disk3 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk3
   1:                        EFI EFI                     209.7 MB   disk3s1
   2:                  Apple_HFS G-DRIVE mobile          999.8 GB   disk3s2

MOUNT OUTPUT FOR PROBLEM DISKS

/dev/disk2s1 on /Volumes/EFI (msdos, local, nodev, nosuid, noowners)
/dev/disk2s2 on /Volumes/G-DRIVE (hfs, local, nodev, nosuid, journaled)
/dev/disk3s1 on /Volumes/EFI 1 (msdos, local, nodev, nosuid, noowners)
/dev/disk3s2 on /Volumes/G-DRIVE mobile (hfs, local, nodev, nosuid, journaled)

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