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7th December 2001, 18:25 | #25 | Link |
Anime Otaku
Join Date: Oct 2001
Location: Illinois, USA
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Calculations
Actually, I made some more precise calculations myself
74 minutes CD = 74 min. * 60 sec. * 75 = 333000 blocks 80 minutes CD = 80 min. * 60 sec. * 75 = 360000 blocks 99 minutes CD = 99 min. * 60 sec. * 75 = 445875 blocks With the regular "Data Mode 1": 74 min CD = 333000 blocks * 2048 bytes = 681984000 bytes = 650.390625 MB 80 min CD = 360000 blocks * 2048 bytes = 737280000 bytes = 703.125 MB 99 min CD = 445875 blocks * 2048 bytes = 913152000 bytes = 870.84960938 MB Now with the "Data Mode 2", we have: 74 min CD = 333000 blocks * 2336 bytes = 777888000 bytes = 741.85180664 MB 80 min CD = 360000 blocks * 2336 bytes = 840960000 bytes = 802.00195312 MB 99 min CD = 445875 blocks * 2336 bytes = 1041564000 bytes = 993.31283569 MB With "CD-ROM-XA Mode 2 Form 2", we have: 74 min CD = 333000 blocks * 2324 bytes = 773892000 bytes = 738.04092407 MB 80 min CD = 360000 blocks * 2324 bytes = 836640000 bytes = 797.88208008 MB 99 min CD = 445875 blocks * 2324 bytes = 1041564000 bytes = 988.21020126 MB With "CD-DA (or whatever sector format Audio CDs use)", we have 74 min CD = 333000 blocks * 2352 bytes = 773892000 bytes = 746.9329834 MB 80 min CD = 360000 blocks * 2352 bytes = 836640000 bytes = 807.49511719 MB 99 min CD = 445875 blocks * 2352 bytes = 1048698000 bytes = 1000.1163483 MB Hmmm... I don't know how 800MB CDs work Anyone up for the calculations?
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Lapras, luck, and lollipops, Taric25 |
8th December 2001, 12:49 | #26 | Link |
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Nope. All I know is that on 802MB VCD's in ISO Mode 2 it does not have the same amount of error checking as normal data thus the 100 megs more of room available. This is fine for audio and video but no good for data like .exe's or .zip's as they have to be 1000% accurate. A method has already been suggested for writing DiVX to 802MB ISO Mode 2 but no means thus far of reading them back as valid files without a driver being made that can do it.
I live in hope that someone will make one. |
26th January 2002, 10:59 | #27 | Link |
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Does someone of you know a way to write a file with mode 2 form 2. I've tried with CDR-WIN, but probably i missed something.
Ogg files have checksums, so it should be possible to write an ogg file to a CDR mode 2. For info on .ogg file, visit www.powerdivx.com and visit Forum |
27th January 2002, 15:05 | #28 | Link | |
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I burned successfully about 800MB of binary DATA on 80 minutes CDs
Actually, I posted this fact several times and it looked like nobody
cares, so I began to give up. I might add few details later. The essential details are: 1) Burning is MODE2 FORM2 single track on the CD 796MB on 1 CD 80 minutes (835000000 bytes), no overburn, no oversize, speed tested X4, zero errors (!!!) of binary DATA on each of burning on 6 CDRs 760MB--796MB data on each CD. The 7 burn was a coaster but apparently because of overburning 2) Possible to burn two tracks of MODE2, the first track FORM2, the second track FORM1. The I idea is to write in second FORM1 track an EEC file (EEC=Error correcting code). Unfortunaly, the second track steal about 40 MB (may be for LEADIN an LEADOUT burning), but maybe this is a fault of the burning software (I guess 20MB sould be enough for overhead burning). 3) It is not simple to retrieve the burned tracks. Looks like software fault (omit to burn a PVR header to declare the contents and organization of the track). By the way. Apparently --- except maybe CDDA --- RAW data means *always* 2324 bytes per block(=2352 bytes). Some the remaining 18 bytes are used for controll (like ERROR CHECK but not ERROR CORRECTION). Quote:
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28th January 2002, 07:58 | #30 | Link | |
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A few details
Hi,
I don't like to give partial details about the process of burning, because it might lead to confusion, therefore I might write a guide; actually I begin writing the guide and it might take several days. In short: the overall format of the CD is ROM_XA (although other formats, like MIX_MODE maybe also usefull, but I didn't checked in depth other formats). As I said Under ROM_XA one may use one or more tracks, each track in format MODE2_FORM1 or MODE2_FORM2. Seems that multissesions are acceptable by ROM_XA. (I couldn' find a good documentation about the specifications of ROM_XA). I tried CDRWIN but it looks like that this program doesn't help in mastering XA format. I don't see any way to force CDRWIN to master in MODE2_FORM2: when I tried, using CDRWIN, to master a binary data file as a MODE2_FORM2 it mastered it as MODE2_FORM1 instead. I used the program CDRDAO (WWW.SOURCEFORGE.ORG). This program works under WIN32DOS, operates with command lines and uses a mastering ASCII file with ".toc" extention (something like ".cue" file for CDRWIN). If you download CDRDAO from SOURCEFORGE, you'll get sort of "manual" documentation for that program, in PDF document. I don't need any "driver" to read the burned tracks. Essentially, the program ISOBUSTER extracts the tracks from the burned CD. I tested the errors in burning as follows: I created ZIP files with CRC numbers built in them (using the program WINDOWS COMMANDER). After extracting the burned tracks --- I run a CRC test on the extracted files. Quote:
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28th January 2002, 12:46 | #32 | Link | |
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Maybe better ROM_XA burning mastering will make a practical solution
Hi
I'm not CDR programmer, therefore i can only make some intelligent suggestions. My guess is that the solution is fairly simple. My guess is based upon examining a VCD which I bought (printed VCD not burned). This VCD is in ROM_XA format, first track MODE2_FORM1, second and third tracks are MODE2_FORM2 (including the videos). When I insert the VCD in my CD ROM, the videoes are listed as plain files (with ".dat" extention). So my guess is that a good ROM_XA mastering software can create for any file (or even for any folders tree) an ISO image file with "MODE2_FORM1" header or "MODE2_FORM2" header; when burrning that ISO (e.g. by CDRDAO) these headers will tell the CDROM about the organization of the binari data files which are included in the ISO image file (the same was they tell the CDROM about organization in VCD). I know about a "candidate" which can do that job (I don't know him personnally in any way !!!), his name is Herbert Valerio Riedel and he is developing VCD mastering program under GNU (GNU is the freeware organization which supports LINUX freeware, GCC compiler PHP and other zilion freeware projects). I think that a minimal mastering program for ROM_XA might take him very short time, so maybe he might accept a short pause in his VCD mastering project his home page is WWW.GNU.ORG/SOFTWARE/VCDIMAGER. Quote:
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30th January 2002, 13:22 | #33 | Link | |
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test posting
I just test if my registration to this forum was not canceled
by mistake. Also, more good news will be announced after thorough testing. Hint: reading the burned 800MB CD might be very easy. Quote:
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10th February 2002, 15:25 | #34 | Link |
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heres an example of an 800Mb 80minCD
This is by far the most interesting topic I've seen with the most potential!
Indeed it seems that there HAS to be a way to burn multimedia files (in this case DivX) in mode 2 form 2 (or to fit 800Mb on an 80min CD) as most logic and reason seems to point to a way of doing so. How many people are familar with the Dreamcast scene? Dreamcast games come on 1GB GD-ROMS and so to copy a game to a normal CD things would need to be ripped out. Enter Shenmue II. I looked at my copy (80min CD-R) and looked at the contents of the CD. In my computer it came up as 647Mb CD. Further inspecion with Neros session selector indicated 2 seesions, the first one being 100Mb and the second session being 700Mb. (total, just over 800Mb) Interesting? Furthermore, I could look and copy at the contents of the CD to my HD as if they were burnt in mode 1! Also note, The original .CDI image file was over 800MB! Looking at the Discjuggler setting (of the .CDI file) it was burnt as mode 2 AUDIO. But how to master a CD in this way?? Certaintly I can't select mode2/XA form2 in the mastering/burning options in Discjuggler..... All we need is a program that can burn mode2 form2, or at least make it think its an audio or video CD when instead it has a DivX video on it..... comments? |
10th February 2002, 18:56 | #35 | Link | |
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I'll soon publish a minimal guide about burning and retieval
Of any binary data as XA mode2 form2.
Sorry I'm a bit busy, but I'll publish something usefull soon. Maybe you don't realize that there are two problems: "burning" and "retrieval": I guess the "standard CD drivers" of can't retrieve XA mode2 form2 as simply as they retieve CDROM mode1, or CDROM CDDA, or XA mode 2 form1 (the last case is read similarly to CDROM mode1 data). I heard (not confirmed) that the two tracks method (one track mode2 form1 second track mode2 form2) is sort of trick to make the mode2 form2 track readable via a "pointer" in the mode2 form1 track. Any way, I don't see any special reason why such trick can't be appllied for any binary data file in the second mode2 form2 track; looks like burners software don't think this is something usefull (I do, because sometimes a man needs the extra 13 percent store in the CDR). Currently I can retieve XA mode2 form2 only using the program ISOBUSTER (no trick needed); I thought I can do better but I was wrong (so far). Quote:
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22nd February 2002, 16:55 | #37 | Link | |
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Re: So has this gone anywhere?
Quote:
I'll publish *soon* the methods (at least the essential part soon). I should comment that the method is a bit clumsy (it proves feasabilty but only CDR software programmer may create a friendly software). "Fiendliness" means that one can read the burned file systems directly (eg, reading right from WINDOWS EXPLORERE). In my method, one can read only via programs like ISOBUSTER. |
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24th February 2002, 21:09 | #39 | Link |
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since the dvd is 4.7gigs, and begin to be writable
would be more simple to realize a double CD, 1300mb i think that will be more simple and cheap than a double layer of same size. normal CDs cant really go under 25c,just for commercial reasons a double CD of 1300mb, will soon reach that low price and will be always very cheaper that dvd-r. is some year that i hear about double-cd circulating in Asia, anyone knows about this?? see also the CD size pool that i started here |
2nd March 2002, 06:21 | #40 | Link | |
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See my previous post in this thread
I mentioned in this thread a specific person
(the developer of VCDEASY, or the developer of VCDIMAGER, I think). Who can give a nice solution to the problem of "reading directly" the burned stuff. In principle, this might be a solution not different from reading VCD CDs from computer (you can read files with extention like ".dat" consisting of movies as if they are plain data files, although they are in MODE2 FORM2 format). I didn't write to him since I didn't write as yet my guide to my method of burning. I don't believe that he will even start writing anything before repeating my experiments (no body start any "developing initiative" without having serious evidence that the target which wants to achieve is *feasible*, my method is such "feasibility evidence"). Sorry, I can't at this moment finish my guide. There is not much to finish the basic guide but I'm so much troubled with other thinks that I can't even write this simple post. I'll try to finish my basic guide this week, but can't promise. Quote:
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