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How to dynamically modify the size of virtualbox disk
The command tool included with virtualbox can modify the size and type of virtual hard disk.

Manual usage:

Oracle VM VirtualBox Command Line Management Interface Version 4.3.6

Oracle Corporation

property in copyright

Usage:

VBoxManage modifyhd

[–type normal | writethrough | immutable | shareable |

Read Only | Multiple Attachments]

[–Auto Reset On | Off]

[–Property]

[–Compact]

[–Resize |–Resize bytes]

Pengdemabook-air: Windows Chen Peng $ cd VirtualBox\ VMs/windows/

Modify a fixed-size virtual hard disk into a dynamically allocated storage hard disk:

Pengdmabook-air: Windows Chen Peng $ vbox manage modify HD Windows-disk1.vmdk-type normal.

Modify the size of the virtual hard disk to 50G:

Pengdmabook-air: Windows Chen Peng $ vbox manage modify HD Windows-disk1.vmdk–Resize 5 1200.

0%…

Progress status: VBOX_E_NOT_SUPPORTED

VBoxManage: Error: The hard disk resizing operation in this format has not been realized!

Eh, this format is not supported. Ok, let's create a new clone disk.

Chen Peng Windows $ VBoxManage createhd

Usage:

Vboxmanage create HD–file name

[–size |–size byte]

[–diff parent |

[–format VDI|VMDK|VHD] (default: VDI)

[–variant standard, fixed, split 2G, streaming, ESX]

PengdemaBook-air: Windows Chen Peng $ vbox manage create HD-–file name windows.VHD-–size 51200–format vhd–variant standard.

0%… 10%…20%…30%…40%…50%…60%…70%…80%…90%… 100%

The disk image has been created. UUID: 1092 de3a-f9ce-40bc-88 C3-6a 29 ebc 8432 1

Cloning usage:

Pengdemabook-air: Windows Chen Peng $ vbox management clone

Usage:

VBoxManage clone

[–format VDI|VMDK|VHD|RAW|]

[–variant standard, fixed, split 2G, streaming, ESX]

[–Existing]

Pengdemabook-air: Windows Chen Peng $ vbox manage clone HD Windows-disk1.vmdkwindows.vhd–existing.

0%… 10%…20%…30%…40%…50%…60%…70%…80%…90%… 100%

A cloned hard disk created in VHD format. UUID: 1092 de3a-f9ce-40bc-88 C3-6a 29 ebc 8432 1