Most devices, such as a partition on a hard disk, can be described by a single BCD element. However, more complicated devices could exist that require more than one element to describe. A BCD device object is a container for BCD elements for a complex device.
For example, a BCD device object is used when booting from a RAM disk that was created from a Windows image (WIM) file. The device object contains the location of the WIM file and, when booted over the network, the network port information. The BCDEdit identifier for this object is {ramdiskoptions}. The associated GUID is {ae5534e0-a924-466c-b836-758539a3ee3a}). It is also possible to create custom device objects.
The device type has the following layout.
Figure 7. Layout of the BCD device object type
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