Floppy Disk Copy protection

A forum about Atari protected floppy disks analysis, preservation, emulation, tools

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DrCoolZic
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Floppy Disk Copy protection

Postby DrCoolZic » Mon Oct 31, 2011 3:19 pm

I am just restarting a new thread on this subject the old one started more than 5 years ago (viewtopic.php?f=47&t=9012) is hard to follow because I have written a lot of incorrect things at the time ;)

I think that now I have a better understanding of the protection mechanisms used on Atari. You will find attached the new version (version 1.0 :) ) of my document on protection.
Please feel free to give feedback.

____________________________________________________________________________________________________________________________
EDIT November 9, 2014
You can find complementary information about Atari copy Protection/Preservation @ http://info-coach.fr/atari/software/preservation.php
This will also point you to the latest version of the document at http://info-coach.fr/atari/documents/_m ... ection.pdf
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DrCoolZic
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Re: Floppy Disk Copy protection

Postby DrCoolZic » Wed Jun 04, 2014 4:12 pm

Time for a new version :)

This new version is a major rewrite. It includes a lot of new protections like Fuzzy Data Track, unformatted and partially unformated track, more info on NFA, lots of new description for games, detail explanation on unformatted track, NFA etc...
Still needs more work especially in the Analysis of Games/Programs section

However I beehive it contains a lot of useful information
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Re: Floppy Disk Copy protection

Postby troed » Wed Jun 04, 2014 8:37 pm

DrCoolZic wrote:However I beehive it contains a lot of useful information


Many thanks for an interesting read.

/ex-cracker who never knew how the actual disc protections were made. Just how to cancel them out :P

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Re: Floppy Disk Copy protection

Postby bandit » Wed Jun 04, 2014 8:41 pm

holy poo! A very nice document!!!

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Re: Floppy Disk Copy protection

Postby dlfrsilver » Thu Jun 05, 2014 12:38 am

DrCoolZic wrote:Time for a new version :)

This new version is a major rewrite. It includes a lot of new protections like Fuzzy Data Track, unformatted and partially unformated track, more info on NFA, lots of new description for games, detail explanation on unformatted track, NFA etc...
Still needs more work especially in the Analysis of Games/Programs section

However I beehive it contains a lot of useful information


Jean-Louis, Maupiti Islands, Obitus, Golden Axe are all using amiga tracks as protection. Remember Aufit reporting the tracks as Amiga ones ?
Now SPS France representative since the 19th of June 2014. Proud to be an SPS member !

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Re: Floppy Disk Copy protection

Postby AtariZoll » Thu Jun 05, 2014 9:21 am

dlfrsilver wrote:...
Jean-Louis, Maupiti Islands, Obitus, Golden Axe are all using amiga tracks as protection. Remember Aufit reporting the tracks as Amiga ones ?


Is there something really specific in Amiga floppy tracks ?
My Atari work folder state at 30 Jan 2015 : 35 GB, 213002 files

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Re: Floppy Disk Copy protection

Postby dlfrsilver » Fri Jun 06, 2014 9:03 am

AtariZoll wrote:
dlfrsilver wrote:...
Jean-Louis, Maupiti Islands, Obitus, Golden Axe are all using amiga tracks as protection. Remember Aufit reporting the tracks as Amiga ones ?


Is there something really specific in Amiga floppy tracks ?


Yes those tracks are written in amiga format. Aufit detects those tracks, and they are seen as amiga tracks, they are mostly one big tracks with 1 sector per track.
Now SPS France representative since the 19th of June 2014. Proud to be an SPS member !

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Re: Floppy Disk Copy protection

Postby DrCoolZic » Tue Jul 15, 2014 8:47 am

I call those tracks "No Sector Data Track" and they are described page 17.
I need to find a better name!
This cover Amiga tracks but also other kind of tracks ....

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Re: Floppy Disk Copy protection

Postby AtariZoll » Tue Jul 15, 2014 9:20 am

Of course that there is no "one big sector" in such tracks. Also, it is wrong to call it Amiga format, just because track read is normal Amiga way of floppy access.
We can call it: tracks without regular sectors, raw track data, or just track read :D
My Atari work folder state at 30 Jan 2015 : 35 GB, 213002 files

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Re: Floppy Disk Copy protection

Postby Codetapper » Wed Jul 16, 2014 12:48 pm

DrCoolZic wrote:Time for a new version :)

This new version is a major rewrite. It includes a lot of new protections like Fuzzy Data Track, unformatted and partially unformated track, more info on NFA, lots of new description for games, detail explanation on unformatted track, NFA etc...
Still needs more work especially in the Analysis of Games/Programs section

However I beehive it contains a lot of useful information


If you ever update the document again, can you please change the broken link for the Rob Northen interview to the page on codetapper.com (which should stay forever) as it looks like tripod has shut down my account or something :)

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Re: Floppy Disk Copy protection

Postby DrCoolZic » Thu Nov 13, 2014 5:01 pm

Codetapper wrote:
DrCoolZic wrote:Time for a new version :)

This new version is a major rewrite. It includes a lot of new protections like Fuzzy Data Track, unformatted and partially unformated track, more info on NFA, lots of new description for games, detail explanation on unformatted track, NFA etc...
Still needs more work especially in the Analysis of Games/Programs section

However I beehive it contains a lot of useful information


If you ever update the document again, can you please change the broken link for the Rob Northen interview to the page on codetapper.com (which should stay forever) as it looks like tripod has shut down my account or something :)

done

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Re: Floppy Disk Copy protection

Postby DrCoolZic » Thu Nov 13, 2014 5:10 pm

New version 1.3 of the Atari FD protection document.

Lot of work !!!

- Added detail analysis of protections on many new games that have been discussed recently on Atari Forum. Including ECO, Golden Axe, Jupiter Masterdrive, Maupiti Island, Obitus, Time of Lore, Vroom, Wizball, Z-out ...
- Now protection are grouped into two categories: data prot / timing prot
- Added Fuzzy track prot
- More details on Invalid ID field
- More details on shifted tracks
- Added write splice, Sync mark descriptions
- Chapter on preservation
- fixed lot of errors + clarification
...

document is too big to be uploaded (about 7MB) so directly available at http://info-coach.fr/atari/documents/_m ... ection.pdf

Feedback welcome

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Re: Floppy Disk Copy protection

Postby DrCoolZic » Fri Nov 14, 2014 8:35 am

Sorry I messed up during word to pdf conversion and the hyperlinks were not converted properly
Problem is now fixed you should be able to get a working version following the original link. http://info-coach.fr/atari/documents/_m ... ection.pdf

Internal hyperlinks should now work. Tested with Acrobat reader and Pro as well as Chrome / Firefox and IE
Be aware that many browsers use cache for recently visited documents so you may need to do a refresh.
The document should now show version 1.3a

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Re: Floppy Disk Copy protection

Postby Maartau » Mon Nov 17, 2014 2:10 am

:cheers:
MeMBeR Of - aTaRi LeGeNd - / - eLiTe - / - NoExTrA - / ...
Supporting - aTaRiMaNiA - / Huge thanks to all dumpers :thumbs: ...
June 2015 -> always heavily busy with ST(e) & co stuffs :D ...

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Re: Floppy Disk Copy protection

Postby DrCoolZic » Tue Nov 18, 2014 11:34 am

I have just received questions about preservation / backup of floppies. This is obviously related to protections as key disk makes these operations harder to do.

Therefore I have updated my page on Preservation / Backup http://info-coach.fr/atari/software/preservation.php where I compare several preservation techniques/hardware ...
I have tried to be as impartial as possible about the different HW vendors DC / FK / SCP / HxC / CE
So let me know what you think and if you feel I should update

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Re: Floppy Disk Copy protection

Postby Brume » Tue Dec 23, 2014 9:09 am

A quick message to let you know we created a new forum under DrCoolZic's request (nice idea!).

So, all topics mainly devoted to copy/preservation are now located in the Floppy Disk Copy protection forum.

Of course, KryoFlux, SuperCard Pro & Pasti forums are still alive.

Thanks for reading (I told you it would be quick!).


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