However, after a time the rate of growth will slow and the average penalty for write operations will be negligible. While this format takes less space initially, the fact that 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. 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. 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.įor more flexible storage management, use a dynamically allocated image. Open the Ubuntu guest terminal, create a new directory as the mount point for the CD drive and mount the ISO file: sudo mkdir -p /mnt/cdrom sudo mount /dev/cdrom /mnt/cdrom Navigate to the directory and run the n script to install the Guest Additions. ![]() So, for a 10G disk, you will have a 10G file. 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.
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