Visual effects of burning Ritek G04@8x

vbimport

#1

Hello,

I have flashed my 2500a from stock 1.06 fw to Herrie’s 1.07 Bitsetting Beta 4 fw. Promptly proceeding to test the G04@8x capability, I burned 2 discs. Both of these discs pass DVDInfo Pro’s read error test completely clean. However, they differ from ALL the other G04s which I burned at 4x with the 1.06 fw in that when I look on the data side of the disc, on the 4x burned discs, you can see the deep burn pattern from the inside all the way through to the outside. On the discs burned at 8x, you see the deep burn pattern up until about 1.5cm from the edge of the disc, and after this point it looks only a little deeper than an unburned disc. Just to note, the copies I made at 8x were of discs which I had previously copied before at 4x with 1.06 stock fw, so they had the same exact data on them. Also, the discs burned at 8x work fine all the way through on my DVD video player. Any ideas why this happens? Does this mean lower quality? I apologize if I do not know the correct tests which I should be doing to confirm.

Thanks,
DA

PS this is the mediacode (if I got it correctly):
00000000 00 6A 00 00 01 40 C1 FD 9E D8 52 00 02 76 0E 14 .j…@…R…v…
00000010 88 9A 80 00 03 52 49 54 45 4B 47 00 04 30 34 00 …RITEKG…04.
00000020 00 00 00 00 05 88 80 00 00 00 01 00 06 08 12 11 …
00000030 86 67 80 00 07 88 80 00 00 00 00 00 08 05 1B 0E .g…


#2

yep, basically what the nec does is start the burn at 4x, then switches to 6x, then to 8x. every differing burn speed has a different colour/pattern on the disk. this is why when burning at 4x only, u get a nice uniform, even colour; when burning at 8x, u should see 3 different colours (for 4x, 6x and 8x).


#3

Thanks, sunama!

Regards
DA


#4

Out of interest, why can’t you start burning and finish burning only at 8x? Why do you have to burn parts at 4x and 6x?


#5

The tier burn method (4x --> 6x --> 8x) reduces the stress exherted upon the burner.
If the burn strategy was set to burn at 8X right from the start, the drive would have to spin VERY fast at the inner region of the disc.


#6

I’m using Herriestock firmware, and burn every GO4 I have at 8x (about 200 so far) there has never been any colour change visable on my disks.


#7

Migth vary from brand to brand, mine have it too, it’s perfectly normal, since there’s different laser power used for different speeds!


#8

sarahjh, try looking at the disk really closely with the light reflecting off the disk. every disk ive burnt (at 6x or 8x) regardless of brand has slight colour change when switching between write speeds. but hey, thats just me…


#9

You might want to try popping the media under a Ultra Violet light for closer inspection…(if your REALLY bored…)


#10

6x and 8x burns with datasafe g04 + Pioneer 107 show clear bands on the underside.
6x and 8x burns with datasafe g04 + NEC2500a show nothing I can see.
(under any lighting conditions I care to try…not UV)


#11

I assumed it was something to do with the speed of the spinning disc alright. Thanks for clearing that up.

I do see the different colours on my DVD’s (Thats Write DVD-R’s, LEADDATA01 indentifier or something like that, i can’t remember)