F1ReB4LL started a discussion on discord about Xbox / Xbox 360 dumping.
Our current dumping method skips through the full range of every security sector range and fills this data with zeroes.
For Xbox1 discs, it's 16 x 4096 sectors and for Xbox 360 it's 2 x 4096? with each sector being 2048 bytes.
The argument is that this is not in line with the "redump dumping method" and that all data within the main reading area of the disc should be preserved.
Arguments against the current method:
- Fails to preserve all the (readable) data that is located in the security sector ranges.
Arguments in favor of the current method:
- It might be difficult or impossible to dump the missing data. Reading through the physical rings could take a lot of time, and different drives and/or discs could give different results (with some drives being able to read more sectors at the start and end of each ring than others), meaning it could be difficult to verify a dump that is done this way.
- The Xbox console itself blocks out access to the full range of every security sector. Dumping a game on an actual console (using dvd2xbox) results in the drive giving read errors in the the same sectors that are currently skipped on the PC dumping method.
- The data inside the security sector ranges seems to be random garbage that has no meaning or purpose.
I'm aiming to do some tests soon to see how long it would take to do a full dump using different drives and if the results are different between different drives. I only have 1 Xbox1 disc here ATM and it seems to have 5 physical rings, whereas the Xbox 360 discs that I have all seem to have 2 rings (one close to the center and one near the outer edge of the disc). It remains to be seen if all Xbox1 discs have 5 physical rings.