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+graphic: 0.857
+device: 0.825
+virtual: 0.727
+architecture: 0.724
+performance: 0.718
+files: 0.672
+PID: 0.627
+arm: 0.548
+register: 0.515
+risc-v: 0.494
+semantic: 0.486
+permissions: 0.484
+vnc: 0.483
+boot: 0.467
+debug: 0.463
+peripherals: 0.453
+user-level: 0.448
+ppc: 0.447
+mistranslation: 0.410
+socket: 0.404
+kernel: 0.398
+TCG: 0.322
+VMM: 0.279
+network: 0.268
+assembly: 0.203
+i386: 0.201
+hypervisor: 0.186
+KVM: 0.164
+x86: 0.158
+
+On windows, preallocation=full qcow2 not creatable, qcow2 not resizable
+Description of problem:
+Not possible to create a fixed-virtual-disk qcow as one may do on linux.
+One sometimes may want to create a fixed size qcow2, as can be done with the fixed variants of VHDX, VMDK, VDI, 
+
+The advantage of a fixed virtual-disk format, such as fixed-VHDX, fixed-VMDK, fixed-VDI is that it keeps the disk-meta-data as a header bundled along with that is essentially a raw image, allowing for seamless tooling and management of virtual-disks
+
+Workaround use a raw file as diskimage. (see workaround given below)
+
+To be very general, the implementation of this may need to factor in what underlying operations (fallocate, fallocate_punchhole, truncate, sparse) are supported by what filesystems (NTFS, ExFAT, ext4), choice of filesystem-driver (sometimes the driver may not have yet implemented an underlying operation), and operating systems (Linux/Win), and possible workarounds to achieve the same effect in the absence of underlying-operation.
+Steps to reproduce:
+1. open command shell
+2. run the qemu-img command. In my case, qcow2 file is attempted to be created on a drive with ExFAT filesystem.
+Additional information:
+