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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.
The Quick Emulator (QEMU) [4] is a free and open-source emulator that uses dynamic binary translation to emulate a computer's processor; that is, it translates the emulated binary codes to an equivalent binary format which is executed by the machine.
Fabrice Bellard (French pronunciation: [fa.bʁis bɛ.laʁ]; born 1972) is a French computer programmer known for writing FFmpeg, QEMU, and the Tiny C Compiler.He developed Bellard's formula for calculating single digits of pi.
SeaBIOS also runs inside an emulator; it is the default BIOS for the QEMU and KVM virtualization environments, and can be used with the Bochs emulator. It is also included in some Chromebooks , although it is not used by ChromeOS .
Kernel-based Virtual Machine (KVM) is a free and open-source virtualization module in the Linux kernel that allows the kernel to function as a hypervisor.It was merged into the mainline Linux kernel in version 2.6.20, which was released on February 5, 2007. [1]
Some other products such as VMware and Virtual PC use similar approaches to Bochs and QEMU, however they use a number of advanced techniques to shortcut most of the calls directly to the CPU (similar to the process that JIT compiler uses) to bring the speed to near native in most cases.
QEMU has official support for Classic Mac OS version 9.0 through 9.2 and Mac OS X 10.0 up to and including 10.5. [42] QEMU has several advantages over other PowerPC emulators namely supporting a wide range of platforms from Linux to Mac and Windows on current CPU architectures. [42]
Disk Cloning Software Disk cloning capabilities of various software. Name Operating system User Interface Cloning features Operation model License