What is a HDD file?
A .HDD file is primarily known as a Parallels Desktop Hard Disk image. It is created by Parallels, a company that develops virtualization software. The .HDD file acts like a physical hard drive for a virtual machine. It stores the operating system, applications, and all user data. Alternatively, a .HDD file can also be a data backup file for a satellite receiver manufactured by ALI Corp. These backup files often use the zlib data compression format.
How to open HDD files?
To open and run a Parallels Desktop Hard Disk, you normally use Parallels Desktop on a Mac. If you need to access the files inside the virtual drive without starting the virtual machine, you can use Parallels Mounter to mount the drive directly to your computer. Other virtualization tools, such as Oracle VM VirtualBox or VMware Fusion, can sometimes import and convert .HDD files. For satellite receiver backups, you need specific receiver management software. Because the .HDD extension has multiple possible meanings, we recommend using viewer.online/hdd to identify the actual format of your file.
Best practices and troubleshooting
Virtual hard disk files are usually very large. Always ensure you have enough free storage space before copying or moving a .HDD file. If a virtual machine fails to start, the .HDD file might be corrupted. Parallels includes a command-line utility called `prl_disk_tool` that can help repair broken virtual disks. It is highly recommended to regularly back up your important .HDD files to an external drive.
Summary
viewer.online/hdd analyzes .HDD files to identify their exact format and creator software, shows which programs can open the file, and usually previews it. Because .HDD files use the known zlib format, viewer.online/hdd can safely open and display them online, eliminating compatibility problems.