[vbox-dev] writing to VHD/VDI is 50% slower of VMDK?

[Huihong Luo]

This seems to be always the case, writing a large amount of data to vdi/vhd is much much slower than writing to a vmdk disk.
 
I am using the the vboxddu.dll code, and clone physical disk to virtual disk.
 
for example, clone 250G takes about 2.50 hrs to  a vmdk file,  whereas it takes 4 hrs to a vdi file, under exact conditions, quite reproducible. There is only writes to disks, no reads.
 
any ideas?
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