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37 lines
1 KiB
Markdown
37 lines
1 KiB
Markdown
---
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title: "Robustly copying ISOs using dd"
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date: 2019-09-27T22:45:56-04:00
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draft: false
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tags: [ "Linux" ]
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medium_enabled: true
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---
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**Note:** [Currently I favor using `bmaptool`](/blog/bmaptool-iso/)
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This blog post is going to assume that we're writing to `/dev/sdX`. Please change this to whatever disk you're actually trying to write to. I bear no responsibility if you accidentally write to your OS drives.
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Make sure the disk you wish to write to is unmounted.
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```bash
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sudo umount /dev/sdX
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```
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For good measure check `lsblk`....
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Then perform the writing operation
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```bash
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sudo dd bs=4M if=/path/to/distro.iso of=/dev/sdX conv=fdatasync status=progress
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```
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`fdatasync` will wait until the data is physically written into the drive before finishing.
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Once that operation is done we can check to see if it is performed properly. This step will only work for ISOs that have prepared a file similar to `md5sum.txt` that Ubuntu provides....
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```bash
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sudo mount /dev/sdX /mnt
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cd /mnt
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md5sum -c md5sum.txt
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```
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Hopefully you'll see all `OK` and we're good to go!
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