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.configure_disks is responsible for determining the disk controller(s) to use, given the machine configuration and the current disk config. When a machine has a single controller, use it for all attachments. When a machine has multiple controllers, attach disks to the SATA controller and DVDs to the IDE controller. This commit also returns additional attachment information (controller/port/device) with the disk metadata.
Vagrant Core Plugins
These are plugins that ship with Vagrant. Vagrant core uses its own plugin system to power a lot of the core pieces that ship with Vagrant. Each plugin will have its own README which explains its specific role.