------------------------------ The State of the Hi-MD Hack ------------------------------ The following is a wildly apocryphal, and highly speculative attempt at unifying the information available on the state of hacking the current line if Hi-MD player/recorders to function as nature intended. Feel free to make suggestions and/or corrections if you dare. --------------- The Elephant --------------- The makers of these devices have seen fit to force their owners to make all music PC to Device transfers through what they occasionally refer to as a 'magic gate'. The idea is that you own the device, you may even own the media, but we will not trust you with the bits. And every transfer of 'sound' bits from the device to another device shall be mediated by a piece of software which imposes some arbitrary set of restrictions on what can, and when it can be transferred and in which direction. This is akin to GM installing a Chocolate Chip cookie monitor in every vehicle, to prohibit the rampant spread of interstate cookie piracy and distribution. There are numerous undeniably legal uses that would benefit from getting around this scheme, and many other most-probably legal uses that would benefit as well. Specifics: 1. We can only transfer files recorded via MIC or LINE-IN from MD to PC. 2. We can only transfer said file 1 time from MD to PC. 3. Optically recorded files are not transferable from MD to PC. 4. SoundStage is the the only way to access the music portion of the MD data. 5. Mac folks have no hope (that said Virtual PC should work). -------------- What we know -------------- 1. Light-side vs Dark-Side [ -samplehunter ] - When mounted as a USB drive, the HI-MD device shows a directory of files of the form -HI-MD.IND +HMDHIFI | |- 00010012.HMA |- ATDATA04.HMA |- MCLIST03.HMA |- MCLIST04.HMA |- TEXT_G01.HMA +- TRKIDX04.HMA This is the 'light-side' data, that is data we can touch and see. It is presumed (not proven just yet) that there is a portion of the disc that the player reads and writes to and is not exposed via usb - This is aptly called the 'Dark-Side'. Why do we care: 1. Research that points to this dark-side data being used as a part of the encryption of the data 2. A bit for bit copy of a MD would be nice for backup purposes. Examples: Folks have attempted to copy light-side data from one disk to another, or even old light-side data on top of new light side data. It works functionally, but the player will not play the data. -------------------- Technical Hurdles: -------------------- 1. Getting to the data - the meta-data (or most of it) is available through the HMDHIFI directory structure the question is how can we that into a list of music files? 2. Using the data - the data stored on the disk is encrypted and/or obfuscated - such that once we access the music files how will we get them in a form we can play or edit on the pc? 3. Modifying/Adding music data - the 'encryption'/verification scheme seems to depend on more data than the FAT data visible via a usb connection ------------------- Breakthroughs ! ------------------- ** Reading Tracknames - There are 2 programs that can extract track names an put them in human readable form 1. himd-idx - (alexoft) 2. himdlister - (marcnet) The both work by analyzing the file: TRKIDXNN.HMA and pulling the track names from it ** Reading Data 1. himd_xtract - (fishstyc) - will extract OMG files from a mounted Hi-MD player. 2. himd_renderer - (marknet) - will convert an OMG file to .wav, .mp3, or .ogg Hi-md renderer uses the SoundStage libraries to convert the files. Sony has also released a OMG to wav converter. ----------------- Ultimate Goals ----------------- 1. Tops in the unfeasible, but most helpful - would be to find a way to modify the device to record the OMG, PCM files in the clear FAT part of the disk, and to play OMG, PCM or MP3 files placed on the light-side of the disk. 2. Secondary but much more feasible would be to have an installable filesystem driver, that would mount the Hi-MD files as the device sees them, allowing drag-and-drop to and from the disk. examples: gmailfs : http://richard.jones.name/google-hacks/gma...filesystem.html gmail drive shell exension: http://www.viksoe.dk/code/gmail.htm Both cases extend google mail's storage system to make it appear as a regular drive to the client system (os-x does this with ftp, and .mac also) FUSE - seems a likely candidate for doing the same with the data exposed via usb connection on a Hi-MD device. ----------------- Misc. ----------------- Where's the work being done: Some amazing folks at the forums.minidisc.org Who wrote this: Some software geek who just got a Hi-MD recorder and suddenly has a an unusually keen interest in the details of Hi-MD.
