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View topic - Transitioning SF-7000 dumps to use .sf7.dsk format instead of .sf7

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Transitioning SF-7000 dumps to use .sf7.dsk format instead of .sf7
Post Posted: Sat Feb 01, 2025 6:06 pm
As per https://www.smspower.org/forums/20445-RareSegaComAutoComSegaLinkMicroModemSoftwa...

From now on, Sega SF-7000 dumps will be released using the .dsk file format, using the .sf7.dsk extensions. We previously released files using a .sf7 extension with a fixed 163840 bytes size. Those were "raw" dumps of disks assumed to be formatted using a standard 640 sectors disk layout promoted by the Sega Disk Basic, but the floppy disk controller can technically handle other layouts. As per of our ongoing research and work on dumping SF-7000 disks we found many software which couldn't be reliably released using the old .sf7 format.

My friend Thomas Bernard (Nanard) kindly added support for .dsk format in MEKA in January 2022 and we expect other emulators to follow if they haven't already.
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Post Posted: Sat Feb 01, 2025 6:08 pm
Attached are photos of disk layout for:
- a disk formatted using the standard 640 sectors mechanism.
- a disk using a custom layout aimed at copy protection, with intentionally bad sectors and other copy protections tricks (this is "Burglar Bill").
custom layout.jpg (460.17 KB)
custom layout.jpg

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