.HDD File Extension

Parallels Hard Disk Drive File

Disk Image File
The .HDD extension is an abbreviation for a hard disk drive file. The HDD file is actually a bundle of files that represents a virtual hard disk for a Parallels virtual machine.

The HDD file controls the positioning, reading and writing of the hard disk. The .hdd file extension is only relevant for Mac OSX utilizing Parallels Desktop to run multiple guest OS (Windows, Linux, etc.) in a virtual environment.

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