To achieve the best performance (low latency, high I/O), you must move away from emulated IDE/SATA drivers. A. Use VirtIO Drivers (Crucial)
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Do not just use default parameters. Here is the optimized command to launch your Windows 7 installer:
Note: The -f qcow2 flag ensures the correct format.
qemu-img map windows7.qcow2 qemu-img convert -O qcow2 windows7.qcow2 windows7_compacted.qcow2
