Tools like (for USB) or AnyBurn allow you to specify a "Boot Image." When creating the ISO from a folder (like a Windows DVD extraction), you must tell the software: "Sector 7 contains the boot loader."
sudo dd if=/dev/cdrom of=disc_image.iso bs=2048 Warning: dd is powerful. Make sure if= (input file) is your disc drive, not your hard drive. Not all ISOs are equal. A standard data ISO won't start your computer. To create a bootable OS installer, you need to preserve the "El Torito" boot catalog.
In the golden age of physical media, the ISO file was the digital savior. It allowed us to take the exact 1s and 0s of a CD, DVD, or Blu-ray and store them as a single file on a hard drive. iso file create
Linux users have genisoimage (or mkisofs ).
Use ImgBurn (Mode: Read). Insert the disc, select the source drive, choose a destination for the .iso , and click the read button. It will rip the disc sector-by-sector. Tools like (for USB) or AnyBurn allow you
hdiutil makehybrid -iso -joliet -o /path/to/output.iso /path/to/source/folder This command creates a hybrid ISO with Joliet extensions (for long filenames).
Open Disk Utility . Select the optical drive from the side menu (not the volume name below it, the actual physical disk). Click "File" > "New Image" > "Image from [Disc Name]." Choose "DVD/CD master" (which creates a .cdr file) – simply rename the extension to .iso . It works perfectly. A standard data ISO won't start your computer
Use the dd command (Data Dump) – the most direct method.