Well, Clint here it is:
Obviously, you don't have the technical KNOW HOW to address this ISSUE! THIS ISSUE NEEDS TO BE ADDRESSED BY THE "DRIVE DEVELOPER!"
----- Original Message -----
From: Plextor Support Team
To: Clarence A Lawson Sr
Sent: Monday, April 29, 2002 12:24 PM
Subject: RE: SD2 Copy
Plextor does nothing to prevent or allow copy protected discs. If you have a beef with a disc that is copy protected, best to contact the mfgr of that disc and complain to them.
Plextor Support Team - Jack
From: Clarence A Lawson Sr [mailto:email@example.com]
Sent: Monday, April 29, 2002 1:26 AM
To: Plextor Support
Subject: SD2 Copy
This is what I mean when I say that Plextor's 24x and 40x drives CAN NOT write SD2.51 correctly.
SD2. Eight to Fourteen Modulation is used during encoding, because the 8-bit 'magnetic' byte has to be modulated to a 14-bit 'optical' byte. Technically, this modulation is necessary to allow encoding of two consecutive 1s--which would be impossible with the scheme of pits and lands using 8-bit bytes (1s and 0s). In fact, the changes in reflectivity (as the laser light moves along the sequence of pits and lands) are coded as 1 channel bits. Two consecutive 1s are therefore not possible. Moreover, the 'lands' in between the 1s are represented by 0 channel bits, and the number of 0s represent the run-length. The bits in an optical byte are known as 'channel bits' to avoid confusion, and because they are transferred to the controller board through a specific channel. Furthermore, the fourteen-bit optical byte is provided three additional channel bits, known as merging bits--to eliminate transition conflicts between consecutive optical bytes. During the read process, the interface card demodulates the 14- bit optical code to the 8-bit code used by the computer--and all channel bit-level modulation and processing remain transparent to the user.
Now with that in mind, this is how SD2 works:
A regular bit pattern (such as XYXYXYXYXYXY...) fed into the EFM encoder can cause large values of the digital sum value in case the merging bits cannot reduce this value. The scrambler (something found in every CD-ROM/CD-RW) reduces this risk by converting the bits in byte 12 to 2351 of a Sector in a prediscribed way. The sectors mentioned above try in fact to overload the EFM encoder of the CD-Writer, because *AFTER* passing the scrambler the poor device has to write *REGULAR BIT PATTERNS* - something it really doesn't like. That's how SD2 works. [Plextor recorders *CANNOT* write SD2.51 correctly due to additional weak sectors added by MacroVision, whereas SD2 *PRE* v2.51.021 the Plex 24X & and 40X could cope with those weak sectors.]
Clarence A. Lawson, Sr.