[GTALUG] Re: block size for dd -- no difference

Is it possible that the modern disk firmware performs enough buffering to make the block size irrelevant? On Tue, Sep 2, 2025 at 10:41 PM William Park via Talk <talk@lists.gtalug.org> wrote:

I was doing one of those occasional backup of my root SSD to HD. They are identical size, so sector by sector. I took this occasion to see if blocksize (bs=) matters.

for i in {4,16,64,256}K {1,4,16,64}M; do echo ==== $i ==== dd if=/dev/sda of=/dev/sdi bs=$i sync done

No difference. All did 117MB/s.