• Registered: 2019-02-10
  • Posts: 362

As you can see in the pictures attached, this disc has some weird reflection on the data side, like there are 2 gaps/rings in the middle of the data.
This is this disc: http://redump.org/disc/14130/

any idea ? Gap with no data ? data with different reflection ?

I am not an expert, and I just want to know wink

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  • Registered: 2006-12-24
  • Posts: 3,152

https://i.imgur.com/AX6WKyX.jpg
Another ring type on US discs smile

You can try to read that area with IsoBuster or CD Tool.

  • Registered: 2019-02-10
  • Posts: 362

I don't think it is the same type of ring. On yours, it is clearly a weird ring in the non-data part of the disc.
On the bootleg II (total size of data = 619716720), it is inside the data part of the disc (or this is how I see them): data part, then tiny gap, then tiny data part, then tiny gap, then the end of the data. And after, there is the non-data part before the Sega ring.

Better explanation on the picture attached.

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  • iR0b0t
  • iR0b0t
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I think its a holographical effect due to those tracks having some specific byte pattern.

PX-760A (+30), PX-W4824TA (+98), GSA-H42L (+667), GDR-8164B (+102), SH-D162D (+6), SOHD-167T (+12)
  • Registered: 2006-12-24
  • Posts: 3,152

iR0b0t wrote:

I think its a holographical effect due to those tracks having some specific byte pattern.

Something similar to "hidden" Audio CD tracks, it seems. I don't have the image atm, but I believe these tracks are empty.

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  • Registered: 2016-06-15
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Logs from mine:  (Sega Screams Vol 1)
those tracks are indeed empty.

https://mega.nz/#!exEmHARI!_Aoi1EfFFhpC … wycNU6E304

  • Registered: 2019-02-10
  • Posts: 362

iR0b0t wrote:

I think its a holographical effect due to those tracks having some specific byte pattern.

It makes sense, but i never thought it could be seen like that on the cd.

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  • Registered: 2006-12-24
  • Posts: 3,152

Madroms wrote:
iR0b0t wrote:

I think its a holographical effect due to those tracks having some specific byte pattern.

It makes sense, but i never thought it could be seen like that on the cd.

I'd like to remind you the entire outer protection ring can be burned with fully readable SEGA text without any tricks smile The text is formed by the data patterns on the sector level, you can even open the ring dump in the notepad and align the data properly to see the same text.

  • Registered: 2019-02-10
  • Posts: 362

F1ReB4LL wrote:

I'd like to remind you the entire outer protection ring can be burned with fully readable SEGA text without any tricks smile The text is formed by the data patterns on the sector level, you can even open the ring dump in the notepad and align the data properly to see the same text.

This is something I could easily forgot wink

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  • Registered: 2006-12-24
  • Posts: 3,152

Btw, if you like various data patterns, take a look at Applesauce Apple II disk dumps - https://wiki.reactivemicro.com/Applesau … e_Software