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Media Player Classic. Network Stumbler. Cool Edit Pro. Syntrillium Software Corporation. Frets On Fire. Recent Linux and Windows versions support these devices, but Windows needs additional drivers. Currently virtio-scsi controller support is experimental. The virtio-scsi controller will only be seen by OSes with device support for it.

In particular, there is no built-in support in Windows. So Windows will not see such disks unless you install additional drivers. Four slots attached to the traditional IDE controller, which are always present.

Up to slots attached to the virtio-scsi controller, if enabled and supported by the guest OS. Given this large choice of storage controllers, you may not know which one to choose. In general, you should avoid IDE unless it is the only controller supported by your guest. The variety of controllers is only supplied by Oracle VM VirtualBox for compatibility with existing hardware and other hypervisors.

Disk image files reside on the host system and are seen by the guest systems as hard disks of a certain geometry. Like a physical disk, a virtual disk has a size, or capacity, which must be specified when the image file is created.

As opposed to a physical disk however, Oracle VM VirtualBox enables you to expand an image file after creation, even if it has data already. See Section 8. This format is used when you create a new virtual machine with a new disk. Image files of Parallels version 2 HDD format are also supported. Due to lack of documentation of the format, newer versions such as 3 and 4 are not supported.

You can however convert such image files to version 2 format using tools provided by Parallels. Irrespective of the disk capacity and format, as mentioned in Section 1.

If you create a fixed-size image, an image file will be created on your host system which has roughly the same size as the virtual disk's capacity. So, for a 10 GB disk, you will have a 10 GB file. Note that the creation of a fixed-size image can take a long time depending on the size of the image and the write performance of your hard disk. Dynamically allocated. For more flexible storage management, use a dynamically allocated image. This will initially be very small and not occupy any space for unused virtual disk sectors, but will grow every time a disk sector is written to for the first time, until the drive reaches the maximum capacity chosen when the drive was created.

While this format takes less space initially, the fact that Oracle VM VirtualBox needs to expand the image file consumes additional computing resources, so until the disk file size has stabilized, write operations may be slower than with fixed size disks. However, after a time the rate of growth will slow and the average penalty for write operations will be negligible. These are often referred to as known media and come from two sources:. The known media can be viewed and changed using the Virtual Media Manager , which you can access from the File menu in the VirtualBox Manager window.

The known media are conveniently grouped in separate tabs for the supported formats. These formats are:. For each image, the Virtual Media Manager shows you the full path of the image file and other information, such as the virtual machine the image is currently attached to. For virtual hard disks, the Create Virtual Hard Disk wizard is shown. This enables you to create a virtual ISO from selected files on the host.

If you use a file management feature of the host OS to move a disk image to a new location, run the VBoxManage modifymedium --setlocation command to configure the new path of the disk image on the host file system. Remove an image from the known media. You can optionally delete the image file when removing the image. Release an image to detach it from a VM. This action only applies if the image is currently attached to a VM as a virtual hard disk. Type: Specifies the snapshot behavior of the disk.

See Section 5. Location: Specifies the location of the disk image file on the host system. You can use a file dialog to browse for the disk image location.

Size: Specifies the size of the disk image. You can use the slider to increase or decrease the disk image size. To perform these actions, highlight the medium in the Virtual Media Manager and then do one of the following:. Use the Storage page in a VM's Settings dialog to create a new disk image.

By default, disk images are stored in the VM's folder. You can copy hard disk image files to other host systems and then import them in to VMs from the host system. However, some Windows guest OSes may require that you configure the new VM in a similar way to the old one. Do not simply make copies of virtual disk images.

See Section 1. For each virtual disk image supported by Oracle VM VirtualBox, you can determine separately how it should be affected by write operations from a virtual machine and snapshot operations. By default, images are in normal mode. To mark an existing image with one of the non-standard modes listed below, use VBoxManage modifymedium. Alternatively, use VBoxManage storageattach to attach the image to a VM and specify the --mtype argument. Normal images have no restrictions on how guests can read from and write to the disk.

This is the default image mode. When you take a snapshot of your virtual machine as described in Section 1. The image file itself is not reset. Instead, when a snapshot is taken, Oracle VM VirtualBox freezes the image file and no longer writes to it. For the write operations from the VM, a second, differencing image file is created which receives only the changes to the original image. While you can attach the same normal image to more than one virtual machine, only one of these virtual machines attached to the same image file can be executed simultaneously, as otherwise there would be conflicts if several machines write to the same image file.

Write-through hard disks are completely unaffected by snapshots. Their state is not saved when a snapshot is taken, and not restored when a snapshot is restored. Shareable hard disks are a variant of write-through hard disks. In principle they behave exactly the same. The difference only shows if you attach such disks to several VMs. Shareable disks may be attached to several VMs which may run concurrently.

This makes them suitable for use by cluster filesystems between VMs and similar applications which are explicitly prepared to access a disk concurrently. Only fixed size images can be used in this way, and dynamically allocated images are rejected. This is an expert feature, and misuse can lead to data loss, as regular filesystems are not prepared to handle simultaneous changes by several parties.

Immutable images only remember write accesses temporarily while the virtual machine is running. All changes are lost when the virtual machine is powered on the next time.

As a result, as opposed to Normal images, the same immutable image can be used with several virtual machines without restrictions. Creating an immutable image makes little sense since it would be initially empty and lose its contents with every machine restart.

You would have a disk that is always unformatted when the machine starts up. Instead, you can first create a normal image and then later mark it as immutable when you decide that the contents are useful. If you take a snapshot of a machine with immutable images, then on every machine power-up, those images are reset to the state of the last current snapshot, instead of the state of the original immutable image.

As a special exception, immutable images are not reset if they are attached to a machine in a saved state or whose last snapshot was taken while the machine was running. This is called an online snapshot. As a result, if the machine's current snapshot is an online snapshot, its immutable images behave exactly like the a normal image. To reenable the automatic resetting of such images, delete the current snapshot of the machine. Oracle VM VirtualBox never writes to an immutable image directly at all.

All write operations from the machine are directed to a differencing image. The next time the VM is powered on, the differencing image is reset so that every time the VM starts, its immutable images have exactly the same content. The differencing image is only reset when the machine is powered on from within Oracle VM VirtualBox, not when you reboot by requesting a reboot from within the machine.

This is also why immutable images behave as described above when snapshots are also present, which use differencing images as well. If the automatic discarding of the differencing image on VM startup does not fit your needs, you can turn it off using the autoreset parameter of VBoxManage modifymedium. InstallSafe Protect your browser and PC. Privacy Reviver Complete Privacy Protection. MacReviver Complete Mac Optimization.

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