The first layer of the TDM onion is a simple obfuscation. This paper will be extended in the future to cover the slight differences when using Thunderbolt to replace USB mass-storage as an underlying transport. What follows is an analysis of the USB based target disk mode protocol, and also a revelation that the FileVault2 key may be extractable (albeit in wrapped form) from a machine without the OS booted. Moreover, Appleās security features such as encryption and effaceable storage complicate the implementation. Modern USB and Thunderbolt based target disk mode requires a machine that is ordinarily a USB host to become a slave. ![]() Because of the peer-to-peer nature of FireWire and the standard SCSI command set, implementing a consumer in linux for this protocol was relatively straight forward. ![]() In earlier generations of Apple MacBook computers, TDM or Target Disk Mode was a boot mode that made all internal drives appear to an external FireWire capable system to be LUNs which could be consumed by another endpoint (This usually included the internal Hard Drive and CD/DVD-ROMs).
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