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--- ubuntu:iso:create_iso_from_a_bootable_usb_drive [2024/07/30 14:21] – peter
+++ ubuntu:iso:create_iso_from_a_bootable_usb_drive [2024/07/30 14:22] (current) – peter
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-===== Using dd =====
-**dd** is a powerful Linux tool for a wide range of disk-related tasks:
- * creating disk images
- * copying data between devices
- * performing low-level operations on data
-We can also use dd for converting a bootable USB drive to an ISO file. It enables us to make a bit-for-bit copy of the USB drive’s contents into a single ISO file.
-==== Make a Copy ====
-Create a copy from the bootable USB to a file:
-<code bash>
-sudo dd if=/dev/sdb1 of=myisofile bs=4M status=progress
-</code>
-<WRAP info>
-**NOTE:**  This creates a raw binary copy of the USB in the current directory.
-These are optional, but do help:
-  * **bs=4M**:  Read and write up to 4M at a time; to make I/O faster.
-  * **status=progress**:  Provide a progress report while dd runs.
-</WRAP>
-----
-==== Convert the raw binary file to an ISO format ====
-Install genisoimage:
-<code bash>
-sudo apt install genisoimage
-</code>
-----
-Convert the raw file to an ISO format:
-<code bash>
-sudo genisoimage -o converted.iso -input-charset utf-8 -R -J myisofile
-</code>
-<WRAP info>
-**NOTE:**
-  * **-o**: converted.iso specifies the name of the output ISO file in proper ISO 9660 format.
-  * **-input-charset utf-8**: sets the character encoding for the ISO image.
-  * **-R**: generates the Rock Ridge extension for UNIX file attributes.
-  * **-J**: generates the Joliet extension for Windows file systems.
-The output **converted.iso** will be in a standard ISO format and can be used for various purposes, including burning to optical media or distributing bootable images.
-</WRAP>
-----
-==== Verify the ISO Format ====
-Perform a simple check to examine the ISO’s structure and extract information about its content.
-<code bash>
-sudo isoinfo -d -i converted.iso
-</code>
-returns:
-<code>
-CD-ROM is in ISO 9660 format
-System id: LINUX
-Volume id: CDROM
-...
-Volume set size is: 1
-Volume set sequence number is: 1
-Logical block size is: 2048
-Volume size is: 123456
-Joliet with UCS level 3 found
-Rock Ridge signatures version 1 found
-</code>
-<WRAP info>
-**NOTE:**  **isoinfo** is a part of the genisoimage package:
-The resulting output confirms that the converted.iso file is in the ISO format.
-It provides details about its volume and file system attributes and support for extended file names and attributes.
-</WRAP>