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On 03/09/2013 19:05, Grant Edwards wrote: |
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> On 2013-01-07, Walter Dnes <waltdnes@××××××××.org> wrote: |
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> |
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>> For those of you who don't want to do the tap-dance listed at... |
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>> http://www.gentoo.org/doc/en/liveusb.xml |
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>> |
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>> * My netbook's harddrive is normally /dev/sda, except when I boot from a |
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>> USB stick. The stick will become /dev/sda and the harddrive becomes |
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>> /dev/sdb |
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>> |
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>> * My desktop's harddrive is also /dev/sda. I took the linux minimal |
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>> install ISO, ran isohybrid on it, with the command... |
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>> |
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>> isohybrid install-x86-minimal-20121213.iso |
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>> |
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>> If you don't have isohybrid... |
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>> |
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>> emerge sys-boot/syslinux |
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>> |
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>> * I then copied it over to a USB stick (/dev/sdb) with the command... |
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>> |
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>> dd bs=4M if=install-x86-minimal-20121213.iso of=/dev/sdb |
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> |
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> I did a 64-bit install from USB flash-drive a few days ago using the |
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> older tap-dance, and it worked fine -- except I discovered one of my |
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> "must have" apps is 32-bit only and didn't work correctly when run in |
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> 32-bit emulation mode (I don't know why). |
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> |
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> So I tried Walter's recipe yesterday to do a 32-bit install. |
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> |
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> After running the isohybrid command, I compared the resulting image |
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> with the original. They were identical. I copied the image to a USB |
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> flash drive, and it booted just fine. |
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> |
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> It seems that the minimal install .iso images are already built for |
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> hybrid booting from either CD or a generic block device (e.g. USB |
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> mass-storage device). |
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> |
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> So what's the deal with http://wiki.gentoo.org/wiki/LiveUSB/HOWTO? |
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> |
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> Why isn't it just the steps below? |
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> |
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> 1) Copy the minimal install .iso to USB mass storage device. |
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> |
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> 2) Boot from USB mass storage device. |
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|
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Copying an .iso to a USB stick does not give you a bootable USB stick. |
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It gives you a USB stick with one large file, without bootloader, and |
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the BIOS code can't make sense of it. |
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|
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USB mass storage devices are not CDs, you can't just dd an ISO9660 image |
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to a USB stick and expect it to work (although files named *.img will |
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often work doing exactly this) |
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This is why unetbootin takes so long to do it's thing, it has to unpack |
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image files and write them file by file to the USB stick |
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-- |
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Alan McKinnon |
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alan.mckinnon@×××××.com |
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