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FreeBSD amd64; rv:102.0) Gecko/20100101 Thunderbird/102.3.0 Subject: Re: Block sizes for dd(1) to USB memory sticks (flash drives) for installers for FreeBSD Content-Language: en-GB To: freebsd-hackers@freebsd.org References: <1cede94a-c114-17fa-a81c-bb58c2b5879c@freebsd.org> <3ea35f4d-8efa-cf93-d462-0d8ce997b7aa@freebsd.org> From: Graham Perrin Organization: FreeBSD In-Reply-To: <3ea35f4d-8efa-cf93-d462-0d8ce997b7aa@freebsd.org> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------VdNCbriUloTrUNMwJK6b3QF9" ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1664667939; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=kQA0buDjlJMcCk73l+kamCCYI65nvVLa3s+Qj2QYgrQ=; b=hgf3XY5R/ThoncGT2osONH3AwqnI13v/jNoN5Wai7top/6752EfSgJgZ9kT6oGoKdhBxEQ YqB12Niu70Bz2oL5JFiay1EBYUvYU8uGkCh0Yyu66bdNOA5bAABaxrfxWcJtS6DSRAVSXZ qwINjRG64YMeyDiKXxwGw2VOISd1LSTfIscsfEdVKqffqbTQiMUaroRObGyeoP/Y9ktykA 1deYF3iE8zWL+MFY6AKfIyQ4Hq9kw0cAELwRedCAgPQk7GgOj0kCaFGzZZ1ZHDvrPdb4x9 dCgFeNShBZD0rk9OAloFVQALJDcg3EHg+5r02IAdcLud5LCfsAOvJ9HCv/++2A== ARC-Seal: i=1; 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On 30/09/2022 17:33, Craig Leres wrote= :
On 9/30/22 00:26, Graham Perrin wrote:
<http= s://www.freebsd.org/releases/13.1R/announce/#_availability> and elsewhere:

bs=3D1m

Why so small?

I find things much faster with a larger block size. Is this my imagination?

I rarely use dd after learning about recoverdisk(1). But I see why dd would be referenced in installation instructions (e.g. switching from a linux distro).

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Craig


Evidently, the difference in speed was my imagination.

I found less than one second difference between these two commands:

time recoverdisk -v FreeBSD-13.1-RELEASE-amd64-dvd1.iso /dev/da3

time gdd if=3DFreeBSD-13.1-RELEASE-amd64-dvd1.iso of=3D/dev/da3 status=3Dprogress conv=3Dsync bs=3D10M

recoverdisk(1) is a great hint. Thanks.

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