What is known about the information transferred over the USB link?
NetMD hacking is still in its infancy. So far, however: • Known elements of the protocol: The Open/NMD project is documenting the protocol as it progresses. • Further Protocol Documentation: The FreeMD documentation sheet has low level details of (known) NetMD USB transactions. • Encrypted PCM transfers for SP mode tracks: Judging from the careful experiments of Lance Birch, it appears that when NetMD downloading is being used for creating Minidisc SP mode tracks, the OpenMG software decompresses the [always LP2 or LP4 mode] PC file to standard 16bit, 44.1kHz PCM audio, encrypts it, and downloads that. The fact that PCM is being used for recording SP mode tracks is heartening since it indicates that NetMD downloads could retain SP mode audio quality, given the right PC software. Though current NetMD recorders reportedly offer only 1.6x speed downloading for SP mode tracks, USB 1.1’s 12Mbps bandwidth would allow downloads at up to 8x realtime. Certainly the technology in Sony’s MXD-D40
NetMD hacking is still in its infancy. So far, however: • Known elements of the protocol: The Open/NMD project is documenting the protocol as it progresses. • Further Protocol Documentation: The FreeMD documentation sheet has low level details of (known) NetMD USB transactions. • Encrypted PCM transfers for SP mode tracks: Judging from the careful experiments of Lance Birch, it appears that when NetMD downloading is being used for creating Minidisc SP mode tracks, the OpenMG software decompresses the [always LP2 or LP4 mode] PC file to standard 16bit, 44.1kHz PCM audio, encrypts it, and downloads that. The fact that PCM is being used for recording SP mode tracks is heartening since it indicates that NetMD downloads could retain SP mode audio quality, given the right PC software. Though current NetMD recorders reportedly offer only 1.6x speed downloading for SP mode tracks, USB 1.1’s 12Mbps bandwidth would allow downloads at up to 8x realtime. Certainly the technology in Sony’s MXD-D40
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