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superg / redumper

Low level CD dumper utility
GNU General Public License v3.0
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Feature Request - DVD (CD?) mode - Read discs in reverse #41

Open ehw opened 1 year ago

ehw commented 1 year ago

There are certain copy protection mechanisms like Alpha-DVD, TAGES, or things that use twin sectors that for some reason read better if the discs that utilize them are read in reverse? DIC and AARU support reading at least DVDs this way, but I'm not sure if there are any applications for adding support for normal CD mode though. It might be best discussing this with VGPC for best applications.

superg commented 5 months ago

Not sure of DVD's but for CD there is no such thing as reading backwards. Spiral always goes outwards, every time you seek backward, it actually seeks a little bit earlier and reads forward until the needed sector is found. Who's VGHF?

ehw commented 5 months ago

meant VGPC, the discord.

wrong acronym

superg commented 5 months ago

Ah lol, I thought there is some domain expert on reverse reads :)