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Preallocating metadata (-o preallocation=metadata) reduces fragmentation on spinning disks. Full preallocation (preallocation=falloc) reserves all space at creation.

qemu-img convert -O qcow2 -c windows7.qcow2 windows7_compressed.qcow2

The -c flag enables compression. Be careful—compression reduces size but increases CPU usage during reads.

QEMU-img supports dozens of formats:

# From VMDK
qemu-img convert -f vmdk -O qcow2 windows7.vmdk windows7.qcow2
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Windows 7 Qcow2 File

Preallocating metadata (-o preallocation=metadata) reduces fragmentation on spinning disks. Full preallocation (preallocation=falloc) reserves all space at creation.

qemu-img convert -O qcow2 -c windows7.qcow2 windows7_compressed.qcow2

The -c flag enables compression. Be careful—compression reduces size but increases CPU usage during reads.

QEMU-img supports dozens of formats:

# From VMDK
qemu-img convert -f vmdk -O qcow2 windows7.vmdk windows7.qcow2

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