Definition: A disk image is a file that contains a complete copy of the data and structure of a storage device, including partitions, file systems, and boot information.
Explanation
A disk image is a file that represents the entire contents and structure of a storage device, such as a hard drive, USB flash drive, or SD card. It can include all sectors of the device, preserving partition tables, boot sectors, file systems, and hidden data. Disk images are used to create exact copies of physical storage media or to emulate storage devices in virtual environments.
Example
For example, an IMG file is a raw disk image that contains a sector-by-sector copy of a USB flash drive, making it ideal for duplicating the drive exactly. In contrast, a VHD file is a virtual hard disk container used in virtualization software, which requires interpretation before it can be written to physical media.
Who This Is For
This term is useful for IT professionals, system administrators, and anyone involved in data backup, recovery, virtualization, or physical media duplication who needs to understand how storage devices are copied or emulated.
Related Terms
IMG file,VHD file,virtual hard disk,USB duplication,partition table,boot sector
Also Known As
disk image file,disk image format