To convert VDI to VMDK, you just need to use VirtualBox itself.
VBoxManage clonehd | { -format VDI|VMDK|VHD|RAW| } {-remember }
format: Allow to choose a file format for the output file different from the file format of the input file.
remember: Keep the destination image registered after it was successfully written.
Once this is done, In vmware [...]
