Floppy Disk Copy protection

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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 constructive feedback.
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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 ?
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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 ?
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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.
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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
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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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