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A flat image allocates space ahead of time while a sparse image grows as the virtual machine writes to it. Flat images can use the underlying file system's sparse file capability, as is done with the vmfs format on ESXi. An image can also refer to a parent image and only store changes made in a copy-on-write fashion. This enables creating a ...
These files need to be combined with an image file (usually with .img extension) to be burned. It may also come with a subchannel file (usually .sub). [1] [2] The .ccd extension can be used directly by first-party disc emulator Virtual CloneDrive. It can also be mounted with third-party virtual drives such as Daemon Tools and Alcohol 120%.
Machine and software requirements are written in a file called "Vagrantfile" to execute necessary steps in order to create a development-ready box. "Box" is a format and an extension (.box) for Vagrant environments that is copied to another machine in order to replicate the same environment.
The raw IMG file format is used by several tools: RaWrite and WinImage use the IMG disk image format to read and write floppy disk images. ImDisk and Virtual Floppy Drive can mount a raw image of a floppy disk to emulate a floppy drive under Microsoft Windows. Nero Burning ROM supports reading IMG files for creating bootable CDs.
Xen, a virtual machine monitor, can run in HVM (hardware virtual machine) mode, using Intel VT-x or AMD-V hardware x86 virtualization extensions and ARM Cortex-A7 and Cortex-A15 virtualization extensions. [22] This means that instead of para-virtualized devices, a real set of virtual hardware is exposed to the DomU, enabling it to use real ...
VHDX (Virtual Hard Disk v2) is the successor format to VHD. Where VHD has a capacity limit of 2040 GB, VHDX has a capacity limit of 64 TB. For disk images with this newer format the filename extension vhdx is used instead of vhd. VHDX protects against power failures and is used by Hyper-V. [23] VHDX format is optimized for both HDD and SSD.
The .img extension can also be found on some ISO image files, such as in some images from Microsoft DreamSpark; however, IMG files, which also use the .img extension, tend to have slightly different contents. The .udf file extension is sometimes used to indicate that the file system inside the ISO image is actually UDF and not ISO 9660.
qcow is a file format for disk image files used by QEMU, a hosted virtual machine monitor. [1] It stands for "QEMU Copy On Write" and uses a disk storage optimization strategy that delays allocation of storage until it is actually needed.