In User-Mode Linux, which device represents the guest's virtual hard disk?

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Multiple Choice

In User-Mode Linux, which device represents the guest's virtual hard disk?

Explanation:
User-Mode Linux presents the guest’s disk through a user-space block device. Inside the UML guest, the virtual hard disk appears as a block device named /dev/ubdN (for example, /dev/ubd0 or /dev/ubd1). This /dev/ubd* interface is provided by the UML user-space block driver, mapping a host file to a guest block device. That’s why the correct choice is the one referencing /dev/ubd*, rather than /dev/sda (typical in other VM setups), /dev/vda (KVM/virtio), or the non-disk device /dev/null.

User-Mode Linux presents the guest’s disk through a user-space block device. Inside the UML guest, the virtual hard disk appears as a block device named /dev/ubdN (for example, /dev/ubd0 or /dev/ubd1). This /dev/ubd* interface is provided by the UML user-space block driver, mapping a host file to a guest block device. That’s why the correct choice is the one referencing /dev/ubd*, rather than /dev/sda (typical in other VM setups), /dev/vda (KVM/virtio), or the non-disk device /dev/null.

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