Sega system 24 disks

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dlfrsilver
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Joined: Fri Nov 12, 2010 8:08 pm

Sega system 24 disks

Post by dlfrsilver » Mon Jun 06, 2011 12:52 pm

Hello guys, i would like to know if Kryoflux support Sega System 24 disk format ?

thanks for the answer :)

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IFW
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Joined: Mon Nov 08, 2010 2:42 pm

Re: Sega system 24 disks

Post by IFW » Mon Jun 06, 2011 1:12 pm

Surely you can dump anything from a disk with it at low level... ;)
Please submit a few disk dumps to see whether the content is something supported through an existing image type.

dlfrsilver
Posts: 78
Joined: Fri Nov 12, 2010 8:08 pm

Re: Sega system 24 disks

Post by dlfrsilver » Mon Jun 06, 2011 7:25 pm

Sega System 24 disks are a PC disk format, but with exotic sectors layout on tracks like you can find on some amiga disks.

For instance here is Crackdown floppy disk format : each track has a size per side of $2D00 and 7 sectors that are differents in sizes.

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IFW
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Re: Sega system 24 disks

Post by IFW » Tue Jun 07, 2011 12:18 pm

Please submit a few dumps.

dlfrsilver
Posts: 78
Joined: Fri Nov 12, 2010 8:08 pm

Re: Sega system 24 disks

Post by dlfrsilver » Tue Jul 19, 2011 9:52 pm

Ok, Crackdown Sega system 24 custom disk is uploaded in the SPS server in kryoflux_testdumps\dlfrsilver :)

Enjoy !!!

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IFW
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Re: Sega system 24 disks

Post by IFW » Wed Jul 20, 2011 11:23 am

There does not seem to be anything special about it judging by a quick look.

HD disk, 1us cells, recorded at 300RPM, 80 tracks, double sided.
5x2048, 1x1024, 1x128 bytes sectors per track, standard MFM encoding, not duplicated.

dlfrsilver
Posts: 78
Joined: Fri Nov 12, 2010 8:08 pm

Re: Sega system 24 disks

Post by dlfrsilver » Wed Jul 20, 2011 11:50 am

It's almost impossible to copy this disk with a standard PC drive equipped with a standard controller.

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IFW
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Re: Sega system 24 disks

Post by IFW » Wed Jul 20, 2011 12:17 pm

You'd need to write a program that accesses the FDC directly to set the correct sector sizes, but otherwise it's very straightforward to read/write something like this; there is no (decent) copy protection at all.
At least the dump submitted is very simple, maybe they made it more advanced later?

dlfrsilver
Posts: 78
Joined: Fri Nov 12, 2010 8:08 pm

Re: Sega system 24 disks

Post by dlfrsilver » Fri Jul 22, 2011 11:46 am

Really ? every people who tried to copy the system 24 disk got non-working copies. because the disks are not 1,44mb but 1,9mb HD-PC floppy disks.

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IFW
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Re: Sega system 24 disks

Post by IFW » Fri Jul 22, 2011 1:19 pm

Most PC programs probably can't copy it, but that does not mean it's anything special in terms of format or copy protection - at least not the disk you submitted.

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