'Vorpal (later) analysis'
Author:swolff (registered user: 26 posts )
Date: Thu, Dec 01st, 2011 @ 15:08 ( . )

SYNCs are handled in software by the Vorpal loader, not by the drive's SYNC hardware signal. IIRC, Vorpal syncs may be as short as five 1-bits, which is what you're seeing on the densest tracks. The tracks that do not appear syncless are, in fact, written in the same format as those that do.

IIRC, Vorpal doesn't contain any obfuscation or other deterrents. It's just a very nice fastloader. Pretty, even. Much nicer than the horrible mess that is RapidLok (of course this mess is intentional, making it harder to follow and break). The high data density and long sectors along with the ultra-short sync marks makes Vorpal
tricky to copy using general-purpose disk copiers or nibblers.


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--* Vorpal (later) analysis
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