Knowledge Base

How to mount and use virtual disc files on Synology NAS


Virtual disc files are common amongst users and corporate alike which provide an easy way of accessing software suites or large amount of media files without having to actually obtain a real optical disc. With a Synology NAS server, you can also access virtual disc files with ease from your File Station application. You can also share the mounted disc as a folder to your friends.

This article will guide you through the steps to mount and use virtual disc files on your Synology NAS.

What is a virtual disc file?
A virtual disc file (also known as a disk image) is a single file containing the complete contents and structure representing a data storage medium, usually created by doing a complete sector-by-sector copy of the source medium. The most commonly seen file type is the ISO image file.


  1. Before You Start
  2. Mount a virtual disc file
  3. Unmount a virtual disc file

1. Before You Start

This article assumes that you have done the following tasks for your DiskStation:

  • Hardware installation for Synology DiskStation
  • Software installation for Synology DiskStation Manager (DSM, web-based operating system of DiskStation)
  • Creating volumes and shared folders (See here)
  • Creating users with access privileges (See here)

Refer to Quick Installation Guide for more information about hardware and software installation. You can also see Synology DiskStation User's Guide (available at Synology's Download Center) for a general idea about topics related to this article.

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2. Mount a virtual disc file

In order to mount a virtual disc file, you must first make sure the corresponding file is stored in your DiskStation. You cannot directly mount a virtual disc file in your remote client's platform.

  1. First navigate to the folder that contains the virtual disc file you wish to mount.
  2. Note:
    • .iso files under ISO 9660 and UDF formats are supported.
    • The maximum number of virtual drives that can be mounted in a DiskStation at the same time is 16.
  3. Select the file, then select Tools > Mount Virtual Drive from the drop down menu on the tools bar.
  4. Select the path you want to mount the virtual disc to.
  5. Note:
    • You can have the virtual drive mounted automatically whenever you start the DiskStation by checking the Mount automatically on startup option.
  6. Once you have finished, click OK > Mount.
  7. Note:
    • You can either mount the virtual drive to an existing folder or create a new one. The destination folder has to be empty and cannot contain any other file or folders.
    • Virtual drives mounted to shared folders can be accessed via NFS. However, virtual drives mounted to subfolders will be inaccessible via NFS.
  8. The mounted folder will change its icon to look like a disc drive. Now you can access its contents as if you're using a disc drive.
  9. Note:
    • You cannot edit the contents inside the mounted folder, just as if you cannot edit a disc drive.

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3. Unmount a virtual disc file

If you don't want to use the virtual disc file anymore, you can always unmount it and release the folder space for other usage. Please follow the instructions below.

  1. Right-click on the virtual drive folder you want to unmount, and select Unmount.
  2. The folder will become unmounted and can be edited again.
  3. Note: This will not make any changes to your original virtual disc file.

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