A .dd file is a special backup file.
It is a full copy of a storage device.
This storage device can be:
Hard drive
SSD
USB drive
Memory card
A .dd file copies everything, bit by bit.
Because of this, it is also called a data backup or image file.
Windows cannot open .dd files by default.
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How Is a .dd File Created?
A .dd file is usually made by special tools.
These tools are used for backup or computer investigation.
Some tools that create .dd files are:
dd (Linux command)
FTK Imager
OSFClone / OSFMount
Guymager
A .dd file is not a normal file.
It contains:
Files and folders
Deleted files
Boot information
Hidden data
The size of a .dd file is usually same as the original drive size.
Why Windows Can’t Open .dd Files?
.dd files come from Linux and forensic tools.
Windows does not understand them easily.
Windows does not know:
Where the drive parts start
What file system is used
How to read the raw data
Because of this, Windows needs special software to open .dd files.
How to Open a .dd File in Window
You can use a free tool called OSFMount.
This tool helps Windows read .dd files.
OSFMount can also open:
.vhd
.vmdk
Other disk image files
Steps to Open .dd File Using OSFMount
Step 1
Download OSFMount using the link below this article.
Double-click the file and install it.
Step 2
Open OSFMount after installation.
Step 3
Click File, then choose Mount new virtual disk.
Step 4
Find your .dd file, then click Open.
Step 5
Click Next.
Step 6
Click Next again.
Step 7
Leave the settings as they are.
Click Mount.
Step 8
Right-click the mounted file and click Open.
Step 9
You will now see a new drive in Windows.
You can open it and view the files inside the .dd file.
Video Guide
If this feels confusing, you can watch a video tutorial.
The video shows each step clearly.
Download OSFMount
If you have a .dd backup file and cannot open it,
OSFMount is a good tool to try.
It is:
Free
Small in size
Easy to use
File Details
File Size: 15.2 MB
File Type: .EXE
Supports: Windows 11 / 10 / 8 / 7 / Server
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