Re: Block sizes for dd(1) to USB memory sticks (flash drives) for installers for FreeBSD

In reply to: Graham Perrin : "Block sizes for dd(1) to USB memory sticks (flash drives) for installers for FreeBSD"
Go to: [ bottom of page ] [ top of archives ] [ this month ]

From: Daniel O'Connor <darius_at_dons.net.au>
Date: Fri, 30 Sep 2022 11:34:45 UTC


> On 30 Sep 2022, at 16:56, Graham Perrin <grahamperrin@freebsd.org> wrote:
> <https://www.freebsd.org/releases/13.1R/announce/#_availability> and elsewhere:
> 
> bs=1m
> 
> Why so small?
> 
> I find things much faster with a larger block size. Is this my imagination?

1m seems large and I wouldn't have expected much improvement past, say.. 128k. What sort of improvements do you see?

ISTR when I have looked before it wasn't much better than 16k.

Since it's conv=sync I think you can crank up the size as much as you like without a problem though (unless your destination device is close to the image size in which case the padding might make it appear to fail)

--
Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum