Skip site navigation (1)Skip section navigation (2) 
Date:      Sun, 2 Oct 2022 00:45:37 +0100
From:      Graham Perrin <grahamperrin@freebsd.org>
To:        freebsd-hackers@freebsd.org
Subject:   Re: Block sizes for dd(1) to USB memory sticks (flash drives) for installers for FreeBSD
Message-ID:  <49157a68-f015-d7fb-8b78-759e1b089359@freebsd.org>
In-Reply-To: <3ea35f4d-8efa-cf93-d462-0d8ce997b7aa@freebsd.org>
References:  <1cede94a-c114-17fa-a81c-bb58c2b5879c@freebsd.org> <3ea35f4d-8efa-cf93-d462-0d8ce997b7aa@freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help 
This is an OpenPGP/MIME signed message (RFC 4880 and 3156)
--------------VdNCbriUloTrUNMwJK6b3QF9
Content-Type: multipart/mixed; boundary="------------dlbrzUWdMTjIlneUuu5O5HnO";
 protected-headers="v1"
From: Graham Perrin <grahamperrin@freebsd.org>
To: freebsd-hackers@freebsd.org
Message-ID: <49157a68-f015-d7fb-8b78-759e1b089359@freebsd.org>
Subject: Re: Block sizes for dd(1) to USB memory sticks (flash drives) for
 installers for FreeBSD
References: <1cede94a-c114-17fa-a81c-bb58c2b5879c@freebsd.org>
 <3ea35f4d-8efa-cf93-d462-0d8ce997b7aa@freebsd.org>
In-Reply-To: <3ea35f4d-8efa-cf93-d462-0d8ce997b7aa@freebsd.org>

--------------dlbrzUWdMTjIlneUuu5O5HnO
Content-Type: multipart/alternative;
 boundary="------------3uXyoRfMS9Vn0oCCEsUCCNkk"

--------------3uXyoRfMS9Vn0oCCEsUCCNkk
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: base64
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--------------3uXyoRfMS9Vn0oCCEsUCCNkk
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<html data-lt-installed=3D"true">
  <head>
    <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DUTF=
-8">
  </head>
  <body>
    <div class=3D"moz-cite-prefix">On 30/09/2022 17:33, Craig Leres wrote=
:<br>
    </div>
    <blockquote type=3D"cite"
      cite=3D"mid:3ea35f4d-8efa-cf93-d462-0d8ce997b7aa@freebsd.org">On
      9/30/22 00:26, Graham Perrin wrote:
      <br>
      <blockquote type=3D"cite"><a class=3D"moz-txt-link-rfc2396E" href=3D=
"https://www.freebsd.org/releases/13.1R/announce/#_availability">&lt;http=
s://www.freebsd.org/releases/13.1R/announce/#_availability&gt;</a>
        and elsewhere:
        <br>
        <br>
        bs=3D1m
        <br>
        <br>
        Why so small?
        <br>
        <br>
        I find things much faster with a larger block size. Is this my
        imagination?
        <br>
      </blockquote>
      <br>
      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).
      <br>
      <br>
      =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Craig
      <br>
    </blockquote>
    <p><br>
    </p>
    <p>Evidently, the difference in speed was my imagination. <br>
    </p>
    <p>I found less than one second difference between these two
      commands: <br>
    </p>
    <p>time recoverdisk -v FreeBSD-13.1-RELEASE-amd64-dvd1.iso /dev/da3</=
p>
    <p>time gdd if=3DFreeBSD-13.1-RELEASE-amd64-dvd1.iso of=3D/dev/da3
      status=3Dprogress conv=3Dsync bs=3D10M</p>
    <p>recoverdisk(1) is a great hint. Thanks. <br>
    </p>
  </body>
  <lt-container></lt-container>
</html>

--------------3uXyoRfMS9Vn0oCCEsUCCNkk--

--------------dlbrzUWdMTjIlneUuu5O5HnO--

--------------VdNCbriUloTrUNMwJK6b3QF9
Content-Type: application/pgp-signature; name="OpenPGP_signature.asc"
Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="OpenPGP_signature"

-----BEGIN PGP SIGNATURE-----
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=d97j
-----END PGP SIGNATURE-----

--------------VdNCbriUloTrUNMwJK6b3QF9--

Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?49157a68-f015-d7fb-8b78-759e1b089359>