How to Open .ISO Files: Mounting and Using Disk Images - Colin Mackay

Step-by-step instructions for mounting, extracting, and burning ISO disc image files on Windows, macOS, and Linux.

Last updated: 20 April 2026

What Is an ISO File?

An ISO file is a disc image — a single file that contains an exact copy of the data on an optical disc (CD, DVD, or Blu-ray). The name comes from the ISO 9660 file system standard used for CD-ROMs. ISO files are commonly used to distribute operating system installers, large software packages, and game discs.

Modern operating systems can mount ISO files directly, presenting them as virtual drives. You no longer need to burn them to physical media to access their contents.

Mounting on Windows

Windows 10 and 11 (Built-In)

  1. Locate the .iso file in File Explorer
  2. Double-click the file, or right-click and select Mount
  3. Windows creates a virtual DVD drive with the ISO contents
  4. Access the files through the new drive letter in File Explorer
  5. When finished, right-click the virtual drive and select Eject to unmount

No additional software is needed on Windows 10 or 11. This built-in support handles standard ISO 9660 and UDF disc images.

Windows 7 and 8

These versions do not have built-in ISO mounting. Use a free third-party tool:

  • Virtual CloneDrive — Lightweight, free virtual drive utility
  • WinCDEmu — Open-source, minimal, installs quickly

Mounting on macOS

macOS has native ISO support through DiskImageMounter:

  1. Double-click the .iso file
  2. macOS mounts it automatically and shows the contents in a Finder window
  3. Eject by dragging the mounted volume to the Trash or right-clicking and selecting Eject

Alternatively, use the command line:

hdiutil mount image.iso

Mounting on Linux

Most Linux desktop environments (GNOME, KDE) mount ISO files when you double-click them. From the terminal:

# Create a mount point
sudo mkdir /mnt/iso

# Mount the ISO
sudo mount -o loop image.iso /mnt/iso

# Access the contents
ls /mnt/iso

# Unmount when done
sudo umount /mnt/iso

Extracting ISO Contents

If you prefer to extract the files rather than mount the image:

  • 7-Zip (Windows/Linux) — Right-click the ISO file and select "Extract to". 7-Zip treats ISO files as archives.
  • WinRAR (Windows) — Can also open and extract ISO files
  • The Unarchiver (macOS) — Extracts ISO contents to a folder
  • p7zip (Linux command line) — 7z x image.iso -o./extracted/

Burning ISO to Physical Media

Though less common in 2026, you may still need to burn an ISO to a USB drive or optical disc:

USB Drive (Bootable)

  • Rufus (Windows) — Free tool for creating bootable USB drives from ISO files. Essential for OS installation.
  • balenaEtcher (cross-platform) — Simple drag-and-drop interface
  • Ventoy — Boot multiple ISO files from a single USB drive without flashing each one individually

Optical Disc

  • Windows: Right-click the ISO → "Burn disc image"
  • macOS: Right-click the ISO → "Burn to Disc" (requires an optical drive)
  • Linux: Use Brasero, K3b, or cdrecord from the command line

Creating ISO Files

To create an ISO from a folder of files or from a physical disc:

  • Windows: Use ImgBurn (free) or PowerISO
  • macOS: Disk Utility can create images, or use hdiutil:
    hdiutil makehybrid -iso -joliet -o output.iso /path/to/folder
  • Linux: Use genisoimage or mkisofs:
    genisoimage -o output.iso -J -R /path/to/folder

Security Considerations

ISO files downloaded from the internet should be verified before use:

  • Check checksums: Legitimate software distributors publish SHA-256 checksums. Verify the downloaded ISO matches.
  • Check digital signatures: Some ISO distributors sign their images with GPG keys.
  • Be cautious: ISO files can contain executables. Only download ISOs from official sources — especially for operating system installers.

Frequently Asked Questions

Can Windows open ISO files without extra software?

Yes, on Windows 10 and 11. Just double-click the file or right-click and select Mount.

What is the difference between ISO and IMG?

Both are disc image formats. ISO follows the ISO 9660 standard and is designed for optical media. IMG is a raw disc image that can represent any type of storage. For software distribution, ISO is far more common.

Can I edit an ISO file?

Not directly — ISO is a read-only image format. To modify the contents, extract the files, make your changes, and create a new ISO from the modified folder.