- Launch Disk Utility from Applications>Utilities or Spotlight search
- Insert your USB stick and observe the new device added to Disk Utility
- Select the USB stick device (you may need to enable the option View>Show All Devices) and select
Erase
from the tool bar (or right-click menu) - Set the format to
MS-DOS (FAT)
and if the option shows, the scheme toGUID Partition Map
- Check you’ve chosen the correct device and click Erase
Thanks to this post I found information below:
Run df -h
to locate the SD card's partition, which will be in the pattern /dev/diskns1
, where n
is an integer. In this case, it's /dev/disk2s1
(the other two are external USB hard drives).
$ df -h
Filesystem Size Used Avail Capacity iused ifree %iused Mounted on
/dev/disk1s1 466Gi 422Gi 33Gi 93% 9569543 9223372036845206264 0% /
devfs 194Ki 194Ki 0Bi 100% 672 0 100% /dev
/dev/disk1s4 466Gi 10Gi 33Gi 24% 10 9223372036854775797 0% /private/var/vm
map -hosts 0Bi 0Bi 0Bi 100% 0 0 100% /net
map auto_home 0Bi 0Bi 0Bi 100% 0 0 100% /home
/dev/disk2s1 29Gi 1.5Mi 29Gi 1% 0 0 100% /Volumes/UBUNTU
$ sudo diskutil unmount /dev/disk2s1
Password:
Volume UBUNTU on disk2s1 unmounted
Check that it's been unmounted/it no longer shows up when you run df -h
(otherwise that's what causes the Resource busy
error above
Filesystem Size Used Avail Capacity iused ifree %iused Mounted on
/dev/disk1s1 466Gi 422Gi 33Gi 93% 9569543 9223372036845206264 0% /
devfs 194Ki 194Ki 0Bi 100% 672 0 100% /dev
/dev/disk1s4 466Gi 10Gi 33Gi 24% 10 9223372036854775797 0% /private/var/vm
map -hosts 0Bi 0Bi 0Bi 100% 0 0 100% /net
map auto_home 0Bi 0Bi 0Bi 100% 0 0 100% /home
While it's still unmounted, burn the disk using dd
command
sudo dd bs=1m if=/Users/dlynch/Desktop/ubuntu-20.10-desktop-amd64.iso of=/dev/rdiskn
replacing n
with the N
in /dev/diskNs1
from df -h
step. Make sure to write to /dev/rdiskN
(the disk) and NOT /dev/diskNs1
(the partition), which is something else that causes the Resource busy
error. Also, the reason to use /dev/rdiskN
and not /dev/diskN
is a performance issue you can read more about here
For me it was disc2, so
$ sudo dd bs=1m if=/Users/dlynch/Desktop/ubuntu-20.10-desktop-amd64.iso of=/dev/rdisk2
2805+1 records in
2805+1 records out
2942003200 bytes transferred in 349.080290 secs (8427870 bytes/sec)