Newsgroup: it.comp.hardware.cd
Titolo: Sefedisc 2 e meccaniche philips

incredibile ma vero ... i masterizzatori con meccanica philips sono
gli unici in grado di copiare il safedisc 2 senza patch e hacking vari
sotto č riportato l'articolo di 
http://www.cdrinfo.com/
"...SD2 is a very interesting beast, as some of you already know. Sometimes
a
 copy works only in the CD-Writer, sometimes not at all. Sometimes -
depending
on the writer used - in any CD-ROM. Some people claim, that they had success
with
other burning software. Let me explain, what the reason for all this might
be. (I say "might be",
as the information here is just revealed through observation, but I believe
 I am at least pretty close)
The first funny thing is, that if a SD2 copy doesn't play in a CD-ROM, this
copy has
additional bad sectors,which weren't on the original. As CloneCD reads and
writes
"as is!", I would have assumed, this is simply impossible. So, if you are a
curious guy,
 you can look at these sectors on the original CD (where they are readable).
You will find
a lot of garbage on the first view. But if you run these sectors through a
sector scrambler
(a device, which is in every CD-ROM and CD-WRITER) you see the reason for
all the
 trouble: Regular patterns like 'XYXYXYXYXY...' and so forth.
And this is exactly how the protection works. To understand this, you need
to know,
what the scrambler is used for (from ECMA-130, ISO/IEC 10149):
"A regular bit pattern 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
reduces this risk by
converting the bits in byte 12 to 2351 of a Sector in a prediscribed way.
..."
The sectors I have 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.
After some quick tests, it seems, that some writers are affected by this
problem more than others.
For example, writers based on Philips hardware (Philips, Fujitsu/Siemens,
Acer, just to name a few)
are NOT affected by this at all. With such a writer, you can copy SD2 with
any CloneCD version,
and the copy will run on every CD-ROM. Most other writers will not write
these sectors correctly.
Some writers (Plextor) can at least read the copy they've made, so the copy
will run in the writer,
but not in an ordinary CD-ROM. The reason for this might be, that the writer
is able to position better,
but this is just guess.
I must admit, this is a very, very cool protection: Something is on the
original which
can be read, and not be written. I really didn't believe such a protection
is possible.
Now for the interesting question: Will CloneCD ever be able to overcome this
problem?
Well, you can answer this yourself: I guess not. Okay, you can probably do
nasty tricks
like modifying the pattern. But this isn't what CloneCD is about. It is
called CloneCD,
not PatchCD. In opposite to the belief of some people,CloneCD does not cheat
or modify
data in any way. I like to keep it this way. Will any other software
overcome
this problem? Again, you can answer this yourself: No, unless they are
cheating somehow.
Can a firmware updatefix this? Maybe. But I have the strange feeling, that
the problem
resides in the writer's chipset, not its firmware. Maybe a firmware
workaround would
be possible. But who would be so nice to modify the firmware in this regard?
Conclusion: Either use your Plextor writer to play the copy, or buy a unit
based on
Philips hardware (Philips PCRW804, ACER 4432 for example..."

 sotto è riportato l'articolo di 
http://www.cdrinfo.com/


Magari ti dico una cavolata ma il mio sistema (ultraplex in lettura e teac
in scrittura) copia benissimo il safedisc2  e non ha meccanica Philips....O
sbaglio??      In compenso non ho speranze per il securerom.....
Faxbio

 sotto č riportato l'articolo di 
http://www.cdrinfo.com/
Non č detto che siano gli unici. Per adesso si sa che i Philips funzionano e
che i Plex per esempio pare funzionino solo se leggono loro il CD copiato...
Non sono certo state testate tutte le meccaniche in circolazione , e anche
da modello a modello le cose possono cambiare... (per esempio non č detto
che tutti i philips funzionino...)
Ciao!

azz, allora sono fortunato!!!
si' pero' impara a quotare.
-- 
SCHUMI WORLD CHAMPION 2000
FERRARI WORLD CHAMPION 2000
8-10-2000 DATA DA RICORDARE
attenzione l'indirizzo e-mail non esiste.

 da modello a modello le cose possono cambiare... (per esempio non è detto


Dipende anche da cosa usi per scrivere....
Faxbio