The Wizard creates a persistent virtual disk. A new operating system can be installed onto the virtual disk file without the need to repartition a physical disk or even reboot the host system. The maximum virtual disk size is currently 131072MB (128GB) for IDE virtual hard disks and 262144MB (256GB) for SCSI virtual hard disks. Selecting a size of 4000 megabytes (3.90625GB) should be large enough to hold the guest operating system and all of the software that you intend to install in the virtual machine, with room for data and growth.
A smaller virtual disk size can be specified in this panel. The initial size of the virtual disk is only a few kilobytes and grows dynamically as needed up to the size specified. This occurs transparently to the guest operating system, which always believes that the virtual disk size is actually the full size specified.
You cannot change the maximum virtual disk size once a virtual disk has been created. The actual maximum space available to the guest operating system inside the virtual disk may be very slightly smaller than the amount specified.
Once the Wizard is finished, the Configuration Editor can be used to change the disk mode to undoable or nonpersistent.
A virtual disk is a file on the host file system that contains all data stored in the virtual IDE or SCSI drive visible to the guest operating system. A virtual disk can be created on any type of disk (IDE, SCSI, etc.) and any type of file system (E2FS, FAT, FAT32, NTFS, etc.) supported by the host operating system. The virtual disk can also be created on a removable disk drive or placed on a network file server. The Configuration Wizard places the virtual disk in the virtual machine directory specified earlier. The location can be changed by clicking the Prev button and returning to the Virtual Machine Directory panel.
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