Mac Low-Level Write on an USB Drive: Difference between revisions
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map auto_home on /home (autofs, automounted, nobrowse) | map auto_home on /home (autofs, automounted, nobrowse) | ||
/dev/disk3s1 on /Volumes/NOVA ORDIS (msdos, local, nodev, nosuid, noowners) | /dev/disk3s1 on /Volumes/NOVA ORDIS (msdos, local, nodev, nosuid, noowners) | ||
The device associated with USB can also be identified with Disk Utility: | |||
::[[File:DiskUtility.png]] | |||
Unmount with [[diskutil]]: | Unmount with [[diskutil]]: | ||
Latest revision as of 23:36, 9 December 2018
Internal
Overview
This is the procedure to write an USB drive at low level with dd. This is sometimes necessary when we want to create a bootable USB drive, for example.
Procedure
Insert the USB drive in the drive, the system will mount it and expose it automatically.
Identify the device the USB drive was associated with:
mount /dev/disk1s1 on / (apfs, local, journaled) devfs on /dev (devfs, local, nobrowse) /dev/disk1s4 on /private/var/vm (apfs, local, noexec, journaled, noatime, nobrowse) map -hosts on /net (autofs, nosuid, automounted, nobrowse) map auto_home on /home (autofs, automounted, nobrowse) /dev/disk3s1 on /Volumes/NOVA ORDIS (msdos, local, nodev, nosuid, noowners)
The device associated with USB can also be identified with Disk Utility:
Unmount with diskutil:
diskutil unmount /dev/disk3s1
Write with dd:
dd if=/Users/ovidiu/Desktop/rhel-server-7.6-x86_64-dvd.iso of=/dev/disk3s1