sorry if this is stupid question but here goes anyway. Is there any reason why a RID code would not appear on a DVD? I know that these are burnt rather then pressed and they are recent. I have around 10 from the same suspect and a RID code does not come up on any of them. I have burnt a trial DVD using the suspect's seized DVD writer and it comes up first time.
Any ideas?
What is a RID code?
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jaclaz
Looking through many web sites, it appears that RID is not always implemented.
It also appears to be implemented in several different ways.
The closest I have found is in the RMD in the last border. This displays the recording drive make and model. It then has a number 012061 which could be the serial number. Next is 1.00 followed by 0902060 which could be the manufacture date. This is from a laptop I purchased new about 3 weeks ago.
I am away from my office at the moment,and only have a couple of DVDs to try it on.
It is not in the standard RID format but does look like the same type of information.
sorry if this is stupid question but here goes anyway. Is there any reason why a RID code would not appear on a DVD?
The most important is probably that RID is CD only. (You probably intend to refer to anything that indicates the 'source burner equipment', but the term is reasonably well defined already, and applies only to CD.)
I know that these are burnt rather then pressed and they are recent.
Um … does pressing have anything to do with it? RID is intended to identify a CD burner – as far as I know, it's specified in CD-R/CD-RW specification (Orange Book).
I have around 10 from the same suspect and a RID code does not come up on any of them.
My personal conclusion on RID (as defined by Philips) are that they are so ill-defined that CD burner manufacturers are not very likely to get them right.
For instance, Orange Book stipulates that professional recorders (that is the ordinary CD burner) place the RID in the main channel of the PMA. However, OB also says (I believe) that PMAs are not mandatory when DAO (Disc At Once) recording is used – and so there seems to be an easy loophole. Add to that that RID seems to refer to audio recordings only – which of course was the area of copyright piracy that was of concern when it was invented. (I say 'seem to' and 'believe' … you need the Orange Book for this, and I always thought the NDA you have to sign to get it was a bit too much. I rely on information cleaned from postings in the cdfreak forum, from people who are professionally involved in the optical recording business – but I may be wrong.)
OB also says that on consumer recorders, RID should be recorded in subchannel Q every 100 sector or so … but consumer recorders are defined as stand-alone equipment that only records audio.
There is almost certainly something similar for some of the subformats of the DVD family. But … you probably need to be at least an associate member of the DVD Forum to get your hands on that … and that's 300000 yen.
I have burnt a trial DVD using the suspect's seized DVD writer and it comes up first time.
What comes up the first time? Where? (You're not looking at the Windows Volume Serial Number, are you? That's something else)
Just found the structure of the RMD data. It does include the drive serial number
43 - RMD - Field 1 (Logical Unit & OPC information)
Bit
Byte
7 6 5 4 3 2 1 0
0-31 (MSB) Vendor Identifier #1 (LSB)
32-47 (MSB) Serial Number #1 (LSB)
48-63 (MSB) Model Number #1 (LSB)
64-67 (MSB) Write Strategy Code #1 (LSB)
68-71 (MSB) Recording Power #1 (LSB)
72-79 (MSB) Timestamp #1 (LSB)
80-83 (MSB) Power Calibration Address #1 (LSB)
84-107 (MSB) Running OPC Information #1 (LSB)
108-113 Reserved
114-115 Reserved
116-127 Reserved