VirtualBox 虚拟硬盘不能扩大（出错： VBOX_E_NOT_SUPPORTED）的解决办法

[wenxue@dad5600 ~]$ cd /home/wenxue/VirtualBox\ VMs/WIN7X64VB/

[wenxue@dad5600 WIN7X64VB]$ vboxmanage modifyhd "/home/wenxue/VirtualBox VMs/WIN7X64VB/WIN7X64VB.vdi" --resize 120000
0%...VBOX_E_NOT_SUPPORTED
VBoxManage: error: Failed to resize medium
VBoxManage: error: Resizing to new size 125829120000 is not yet supported for medium '/home/wenxue/VirtualBox VMs/WIN7X64VB/WIN7X64VB.vdi'
VBoxManage: error: Details: code VBOX_E_NOT_SUPPORTED (0x80bb0009), component MediumWrap, interface IMedium
VBoxManage: error: Context: "RTEXITCODE handleModifyMedium(HandlerArg*)" at line 941 of file VBoxManageDisk.cpp




[wenxue@dad5600 WIN7X64VB]$ vboxmanage showhdinfo "/home/wenxue/VirtualBox VMs/WIN7X64VB/WIN7X64VB.vdi" 
UUID:           e4a3****-5***-46**-bd**-20****d1
Parent UUID:    base
State:          created
Type:           normal (base)
Location:       /home/wenxue/VirtualBox VMs/WIN7X64VB/WIN7X64VB.vdi
Storage format: VDIFormat variant: fixed default
Capacity:       61440 MBytes
Size on disk:   61442 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576
In use by VMs:  WIN7X64VB (UUID: 4e4a3****-5***-46**-bd**-20****d14)



[wenxue@dad5600 WIN7X64VB]$ VBoxManage clonehd "/home/wenxue/VirtualBox VMs/WIN7X64VB/WIN7X64VB.vdi" "/home/wenxue/VirtualBox VMs/WIN7X64VB/WIN7X64VB_120.vdi"
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
Clone medium created in format 'VDI'. UUID: 96fe4a3****-5***-46**-bd**-20****d16f0


[wenxue@dad5600 WIN7X64VB]$ vboxmanage showhdinfo "/home/wenxue/VirtualBox VMs/WIN7X64VB/WIN7X64VB_120.vdi" 
UUID:           96fe4a3****-5***-46**-bd**-20****d16f0
Parent UUID:    base
State:          created
Type:           normal (base)
Location:       /home/wenxue/VirtualBox VMs/WIN7X64VB/WIN7X64VB_120.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       61440 MBytes
Size on disk:   53144 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576
[wenxue@dad5600 WIN7X64VB]$ 




[wenxue@dad5600 WIN7X64VB]$ vboxmanage modifyhd "/home/wenxue/VirtualBox VMs/WIN7X64VB/WIN7X64VB_120.vdi" --resize 120000
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
 


[wenxue@dad5600 WIN7X64VB]$ vboxmanage showhdinfo "/home/wenxue/VirtualBox VMs/WIN7X64VB/WIN7X64VB_120.vdi" 
UUID:           96fe4a3****-5***-46**-bd**-20****d16f0
Parent UUID:    base
State:          created
Type:           normal (base)
Location:       /home/wenxue/VirtualBox VMs/WIN7X64VB/WIN7X64VB_120.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       120000 MBytes
Size on disk:   53144 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576
[wenxue@dad5600 WIN7X64VB]$