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65d9607ece
Some Ubuntu installations (e.g., 20.04) create installation disks with strange C/H/S MBR partitions like 3988/255/2. Normally, VirtualBox reads the MBR to guess disk geometry information for the virtual BIOS. Unfortuantely, the strange values from Ubuntu lead to a heavy virtual-disk activity on boot. Therefore, this commit forces the use of calculated values based on the assumption that large disks use LBA addressing anyway. Fixes #4978