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  • Helpful info to add to debian.org/CD/faq/#write-usb for Mac OSX

    From Jason TributeCPS@21:1/5 to All on Wed Jan 11 19:00:01 2023
    Hello, Hopefully you can add this to debian.org/CD/faq/#write-usb <http://debian.org/CD/faq/#write-usb> page to help other users on Mac OSX write an image to a flash drive.

    Below is the addition proposal to the webpage

    Mac OSX Note: Prior to issuing cp or dd commands to a device, you must unmount partitions on the drive to avoid Permissions and Resource Busy busy errors from the system.

    diskutil umount /dev/disk<disk number>s*

    <disk number> is the device number matching the USB FLASH Drive



    Below is the section of the webpage

    How do I write a CD/DVD/BD image to a USB flash drive? <>
    Several of the Debian and Debian Live images, notably all i386, amd64 and arm64 images, are created using the isohybrid technology, which means that they may be used in two different ways:

    They may be written to CD/DVD/BD and used as normal for CD/DVD/BD booting.
    They may be written to USB flash drives, bootable directly from the BIOS / EFI firmware of most PCs.
    On a Linux machine, simply use the cp command, to copy an image to a USB flash drive:

    cp <file> <device>

    Alternatively you can also use dd:

    dd if=<file> of=<device> bs=4M; sync

    where:

    <file> is the name of the input image, e.g. netinst.iso
    <device> is the device matching the USB flash drive, e.g. /dev/sda, /dev/sdb. Be careful to make sure you have the right device name, as this command is capable of writing over your hard disk just as easily if you get the wrong one!
    bs=4M tells dd to read/write in 4 megabyte chunks for better performance; the default is 512 bytes, which will be much slower
    The sync is to make sure that all the writes are flushed out before the command returns.


    Thank you,
    Jason March - jason@tributecps.com
    Tribute CPS
    818.927.1284

    THIS EMAIL AND ANY FILES TRANSMITTED WITH IT ARE CONFIDENTIAL AND ARE INTENDED SOLELY FOR THE USE OF THE INDIVIDUAL OR ENTITY TO WHOM THEY ARE ADDRESSED.
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    <html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hello, Hopefully you can add this to&nbsp;<a href="http://
    debian.org/CD/faq/#write-usb" class="">debian.org/CD/faq/#write-usb</a>&nbsp;page to help other users on Mac OSX write an image to a flash drive.<div class=""><br class=""></div><div class=""><u class="">Below is the addition proposal to the webpage</u></
    <div class=""><br class=""></div><div class=""><b class="">Mac OSX Note:</b>&nbsp;Prior to issuing cp or dd commands to a device, you must unmount partitions on the drive to avoid Permissions and Resource Busy busy errors from the system.</div><div
    class=""><br class=""></div><div class=""><div style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;" class=""><span style="background-color: rgb(255, 255, 255);" class="">diskutil umount /dev/disk&lt;disk
    number&gt;s* &nbsp;</span></div></div><div style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;" class=""><span style="background-color: rgb(255, 255, 255);" class=""><br class=""></span></div><div style="
    margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;" class=""><ul class="MailOutline"><li class=""><span style="background-color: rgb(255, 255, 255);" class="">&lt;disk number&gt; is the device number matching
    the USB FLASH Drive&nbsp;</span></li></ul></div><div style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;" class=""><span style="background-color: rgb(255, 255, 255);" class=""><br class=""></span></div><
    div style="margin: 0px; font-stretch: normal; font-size: 10px; line-height: normal; font-family: Monaco;" class=""><span style="background-color: rgb(255, 255, 255);" class=""><br class=""></span></div><div style="margin: 0px; font-stretch: normal; font-
    size: 10px; line-height: normal; font-family: Monaco;" class=""><span style="background-color: rgb(255, 255, 255);" class=""><br class=""></span></div><div class=""><u class="">Below is the section of the webpage</u></div><div class=""><br class=""></div>
    <div class=""><p style="margin: 1.5em 0px; padding: 0px; border: 0px; outline: 0px; font-size: 16px; font-family: sans-serif; vertical-align: baseline; color: rgb(34, 34, 34); font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(
    255, 255, 255); text-decoration-thickness: initial;" class=""><strong style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;" class=""><a name="write-usb" id="write-usb" style="
    margin: 0px; padding: 0px; border: 0px; outline: 0px; font-weight: inherit; font-style: inherit; font-family: inherit; vertical-align: baseline;" class="">How do I write a CD/DVD/BD image to a USB flash drive?</a></strong></p><p style="margin: 1.5em 0px;
    padding: 0px; border: 0px; outline: 0px; font-size: 16px; font-family: sans-serif; vertical-align: baseline; color: rgb(34, 34, 34); font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness:
    initial;" class="">Several of the Debian and Debian Live images, notably all i386, amd64 and arm64 images, are created using the&nbsp;<i class="">isohybrid</i>&nbsp;technology, which means that they may be used in two different ways:</p><ul style="margin:
    1.5em 0px; padding: 0px 0px 0px 1.5em; border: 0px; outline: 0px; font-size: 16px; font-family: sans-serif; vertical-align: baseline; list-style-position: initial; list-style-image: initial; color: rgb(34, 34, 34); font-variant-ligatures: normal;
    orphans: 2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness: initial;" class=""><li style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;" class="">
    They may be written to CD/DVD/BD and used as normal for CD/DVD/BD booting.</li><li style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;" class="">They may be written to USB
    flash drives, bootable directly from the BIOS / EFI firmware of most PCs.</li></ul><p style="margin: 1.5em 0px; padding: 0px; border: 0px; outline: 0px; font-size: 16px; font-family: sans-serif; vertical-align: baseline; color: rgb(34, 34, 34); font-
    variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness: initial;" class="">On a Linux machine, simply use the&nbsp;<q style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-style:
    italic; font-family: inherit; vertical-align: baseline; quotes: &quot;&quot; &quot;&quot;;" class="">cp</q>&nbsp;command, to copy an image to a USB flash drive:</p><p style="margin: 1.5em 0px; padding: 0px; border: 0px; outline: 0px; font-size: 16px;
    font-family: sans-serif; vertical-align: baseline; color: rgb(34, 34, 34); font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness: initial;" class=""><code style="margin: 0px; padding: 0px;
    border: 0px; outline: 0px; font-style: inherit; font-size: 13px; vertical-align: baseline; color: black;" class="">cp &lt;file&gt; &lt;device&gt;</code></p><p style="margin: 1.5em 0px; padding: 0px; border: 0px; outline: 0px; font-size: 16px; font-family:
    sans-serif; vertical-align: baseline; color: rgb(34, 34, 34); font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness: initial;" class="">Alternatively you can also use&nbsp;<q style="margin:
    0px; padding: 0px; border: 0px; outline: 0px; font-style: italic; font-family: inherit; vertical-align: baseline; quotes: &quot;&quot; &quot;&quot;;" class="">dd</q>:</p><p style="margin: 1.5em 0px; padding: 0px; border: 0px; outline: 0px; font-size:
    16px; font-family: sans-serif; vertical-align: baseline; color: rgb(34, 34, 34); font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness: initial;" class=""><code style="margin: 0px; padding:
    0px; border: 0px; outline: 0px; font-style: inherit; font-size: 13px; vertical-align: baseline; color: black;" class="">dd if=&lt;file&gt; of=&lt;device&gt; bs=4M; sync</code></p><p style="margin: 1.5em 0px; padding: 0px; border: 0px; outline: 0px; font-
    size: 16px; font-family: sans-serif; vertical-align: baseline; color: rgb(34, 34, 34); font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness: initial;" class="">where:</p><ul style="margin:
    1.5em 0px; padding: 0px 0px 0px 1.5em; border: 0px; outline: 0px; font-size: 16px; font-family: sans-serif; vertical-align: baseline; list-style-position: initial; list-style-image: initial; color: rgb(34, 34, 34); font-variant-ligatures: normal; orphans:
    2; widows: 2; background-color: rgb(255, 255, 255); text-decoration-thickness: initial;" class=""><li style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;" class="">&lt;file&gt;
    is the name of the input image, e.g.&nbsp;<q style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-style: italic; font-family: inherit; vertical-align: baseline; quotes: &quot;&quot; &quot;&quot;;" class="">netinst.iso</q></li><li style="
    margin: 0px; padding: 0px; border: 0px; outline: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;" class="">&lt;device&gt; is the device matching the USB flash drive, e.g. /dev/sda, /dev/sdb.&nbsp;<span style="margin: 0px;
    padding: 0px; border: 0px; outline: 0px; font-style: italic; font-family: inherit; vertical-align: baseline; color: rgb(68, 68, 68);" class="">Be careful to make sure you have the right device name</span>, as this command is capable of writing over your
    hard disk just as easily if you get the wrong one!</li><li style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;" class=""><q style="margin: 0px; padding: 0px; border: 0px;
    outline: 0px; font-style: italic; font-family: inherit; vertical-align: baseline; quotes: &quot;&quot; &quot;&quot;;" class="">bs=4M</q>&nbsp;tells dd to read/write in 4 megabyte chunks for better performance; the default is 512 bytes, which will be much
    slower</li><li style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-style: inherit; font-family: inherit; vertical-align: baseline;" class="">The&nbsp;<q style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-style: italic; font-
    family: inherit; vertical-align: baseline; quotes: &quot;&quot; &quot;&quot;;" class="">sync</q>&nbsp;is to make sure that all the writes are flushed out before the command returns.</li></ul><div class="">
    <meta charset="UTF-8" class=""><div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-
    align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break:
    after-white-space;" class=""><br class="Apple-interchange-newline"><br class=""></div><div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-
    weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;
    word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Thank you,</div><div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-
    caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-
    decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Jason March - <a href="mailto:jason@tributecps.com" class="">jason@tributecps.com</a>&nbsp;</div><div dir="auto" style="caret-color: rgb(0, 0, 0);
    color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows:
    auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Tribute CPS</div><div dir="auto" style="caret-color:
    rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space:
    normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">818.927.1284</div><div dir="auto"
    style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform:
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    <div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent:
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    "">THIS EMAIL AND ANY FILES&nbsp;TRANSMITTED WITH IT ARE&nbsp;CONFIDENTIAL AND ARE&nbsp;INTENDED&nbsp;SOLELY FOR THE USE&nbsp;OF THE&nbsp;INDIVIDUAL OR ENTITY TO&nbsp;WHOM THEY&nbsp;ARE ADDRESSED.<br class="">This document may contain&nbsp;information
    covered&nbsp;under the Privacy&nbsp;Act, 5 USC 552(a), and/or the&nbsp;Health&nbsp;Insurance Portability and&nbsp;Accountability&nbsp;Act (PL 104-191) and&nbsp;its various implementing&nbsp;regulations&nbsp;and must be protected in accordance&nbsp;with
    those provisions. If you are not&nbsp;the intended&nbsp;recipient or the person&nbsp;responsible for delivering&nbsp;the email to&nbsp;the intended recipient, be advised&nbsp;that&nbsp;you have received this email in error&nbsp;and that&nbsp;any use,
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