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Difficulty creating USB boot drive (legacy) using Mac OSX and a workaround

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Hopefully this issue can be corrected, but in the meantime here's some help for you Mac users.

 

I've been pulling my hair out trying to create a bootable Unraid USB drive (legacy not UEFI, because.. reasons) on my MAC.  The USB Creator App for Mac works fine.  The issue is with the scripts to make the USB drive legacy bootable.

 

I tried this on an Intel based Mac, and Apple Silicon with the same problem.

 

When I go to run the "make_bootable_mac" script it runs as far as copying syslinux to /tmp/UNRAID/syslinux where it runs another script  from /tmp/UNRAID/syslinux "make_bootable_mac.sh" that fails at the final step
"/tmp/UNRAID/syslinux/syslinux -f --install ${TARGET}s1 1>&3 2>&4"

 

If I execute the necessary steps manually, repeating that last command twice, it will actually work:

Note the USB thumbdrive is mounted as /dev/disk4s1

 

goodbeer:syslinux dawg$ sudo dd if=/tmp/UNRAID/syslinux/mbr.bin of=/dev/disk4
0+1 records in
0+1 records out
447 bytes transferred in 0.054336 secs (8227 bytes/sec)
goodbeer:syslinux dawg$ sudo /tmp/UNRAID/syslinux/syslinux -f --install /dev/disk4s1
syslinux for Mac OS X; created by Geza Kovacs for UNetbootin unetbootin.sf.net
"/dev/disk4s1" unmounted successfully.
/dev/disk4s1            DOS_FAT_32                         /Volumes/UNRAID
mountpoint is '/Volumes/UNRAID'
checkpoint1
checkpoint2
checkpoint3
Processing: /Volumes/UNRAID/ldlinux.sys
checkpoint4
checkpoint5
checkpoint6
checkpoint7
Processing: /Volumes/UNRAID/ldlinux.c32
checkpoint8
checkpoint9
checkpoint10
hdiutil: unmount: "/dev/disk4s1" failed to unmount due to error 49168.
hdiutil: unmount failed - Resource busy
couldn't open device: Resource busy

 

goodbeer:syslinux dawg$ sudo /tmp/UNRAID/syslinux/syslinux -f --install /dev/disk4s1
syslinux for Mac OS X; created by Geza Kovacs for UNetbootin unetbootin.sf.net
"/dev/disk4s1" unmounted successfully.
/dev/disk4s1            DOS_FAT_32                         /Volumes/UNRAID
mountpoint is '/Volumes/UNRAID'
checkpoint1
checkpoint2
checkpoint3
Processing: /Volumes/UNRAID/ldlinux.sys
checkpoint4
checkpoint5
checkpoint6
checkpoint7
Processing: /Volumes/UNRAID/ldlinux.c32
checkpoint8
checkpoint9
checkpoint10
"/dev/disk4s1" unmounted successfully.
checkpoint11
checkpoint12
checkpoint13
checkpoint14
checkpoint15
/dev/disk4s1            DOS_FAT_32                         /Volumes/UNRAID
syslinux installed successfully!

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