Are direct writes to block devices buffered? How do I ensure it's written to disk before removing it?

Asked Sep 16 '21 at 23:02

Active Sep 24 '21 at 05:23

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Say I do something like dd if=file of=/dev/sdc (simplified for illustration), is this buffered? Can I sync it like I would any other filesystem write, or do I need to do something else to make sure the write is persistent?

asked Sep 16 '21 at 23:02

Daffy

I usually do the sync, and I think that is enough. – nobody Sep 24 '21 at 05:28
Plan ahead and use conv=fsync if your dd supports it. – Kamil Maciorowski Sep 24 '21 at 06:00

Are direct writes to block devices buffered? How do I ensure it's written to disk before removing it?

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