ISOs Explained + four programs to make Linux boot media

mesamune@lemmy.world to Linux@lemmy.ml – 163 points –
ISOs Explained + four programs to make Linux boot media
makertube.net
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dd, or cat with a shell redirect are all you need to write that iso.

My trouble with dd is all the flags I need to remember to make it fast and more convenient. dd if=file of=/dev/device oflag=direct status=progress bs=1M is there anything I'm missing?

bs=1M

This part varies based on your hardware (my hardware is much faster with a value of 4096) , but other than that it's everything.

Here is a handy script that can help determine which bs size is best for your hardware.

Neat! I'll have to try that out.

dd can be soooo much faster too. But like you, I always forget the tags. I should make an alias sometime...

The video description says it's aimed at Windows users, dd and cat have no power there

oflag=direct

What does this do?

oflag=direct

Prevents the writes from piling up in the cache. dd will report the transfer is done when the writes have been cached so this setting prevents dd from exiting until the data has been written completely to the block device.

Use conv=fsync

This ensures the cache is written before dd exits, but doesn't necessarily write to disk directly. This means that, for small files, dd can finish release its hold on the input file quicker