[rear-users] Convert ISO to USB

Brent Bolin brent.bolin at gmail.com
Tue Feb 9 18:08:59 CET 2016


I did try that -

>> fdisk -l rear-host110.iso

Disk rear-host110.iso: 77 MB, 77594624 bytes
64 heads, 32 sectors/track, 74 cylinders, total 151552 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x5be95d00

           Device Boot      Start         End      Blocks   Id  System
rear-host110.iso1   *           0      151551       75776   17  Hidden
HPFS/NTFS

Funky.  Don't remember if I used unetbootin syntax to create, think I did.
Seemed to reboot a couple of times and then take a real long time to reload.

Typeical hybrid iso looks like this -

>> fdisk -l ubuntu-12.04.5-server-amd64.iso

WARNING: GPT (GUID Partition Table) detected on
'ubuntu-12.04.5-server-amd64.iso'! The util fdisk doesn't support GPT. Use
GNU Parted.


Disk ubuntu-12.04.5-server-amd64.iso: 722 MB, 722468864 bytes
255 heads, 63 sectors/track, 87 cylinders, total 1411072 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x3ff07489

                          Device Boot      Start         End      Blocks
Id  System
ubuntu-12.04.5-server-amd64.iso1   *           0     1411071      705536
 0  Empty
ubuntu-12.04.5-server-amd64.iso2           90376       94727        2176
ef  EFI (FAT-12/16/32)

Don't want to make a big deal about this.  Just want to know what others
are using

On Tue, Feb 9, 2016 at 10:02 AM, Schlomo Schapiro <schlomo at schapiro.org>
wrote:

> Hello Brent,
>
> good point. Maybe calling isohybrid on the resulting ISO is actually
> enough (see http://www.syslinux.org/wiki/index.php/Isohybrid).
>
> Can you test that please? If that works then we can simply add that as an
> additional step.
>
> Kind Regards,
> Schlomo
>
> On 9 February 2016 at 16:09, Brent Bolin <brent.bolin at gmail.com> wrote:
>
>> What are people using to convert iso images?
>>
>> I want to create backups and ISO on a nfs mount.  I've been testing Rear
>> using virtualbox so I copy the iso back to my desktop and set virtualbox vm
>> to use it.
>>
>> The documentation on the website indicates this -
>>
>> sfdisk /dev/sdd <<EOF
>> ;
>> EOF
>>
>> mkfs.vfat -F32 -n REAR-USB  /dev/sdd1
>> Pull and replug the USB stick. Verify it is mounted.
>>
>> unetbootin method=diskimage isofile=/path/to/[ISO].iso installtype=USB
>> targetdrive=/dev/sdd1 autoinstall=yes
>>
>> However when I look ( fdisk -l /dev/sdb) at the usb flash it shows it as
>> a Linux partition.  And then running mkfs.vfat -F32 on that same
>> partition.  Doesn't seem correct.  Sometimes it boots.  Sometimes it drops
>> me to grub.  Kinda flaky.
>>
>> Since the iso created by Rear isn't a hybrid(fdisk -l myimage.iso) iso I
>> can't simply use 'dd' to the non partitioned device (/dev/sdb).
>>
>> Would like to know what others are using.  Want a reliable way to create
>> usb flash drives since this would generally be used in an emergency
>> recovery.
>>
>>
>> Thanks
>>
>>
>>
>>
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>>
>>
>
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