889Mb mpg2 file on a 90mnute CDR won't play on DVD drive but

[Reggie]

Hello All, I have a plexwriter PX161040a CDRW drive, it is capable of burning up to 96 minutes to the right Media, So, I thought I'll get 25 discs and have a play with bigger bitrates for SVCD. So, I made a mpg2 vid/audio file, the filesize turned out to be 889Mb which worked out at 88mins 22Seconds when I threw it into Nero to burn.

The disc burned fine (I didn't even get any ATAPI errors which the Plextors are known for with overburning) So, I played the disc in the CDRW and it plays back fine, all the way to the end of the disc (if it can write it, it should be able to read it!). Then I tried it in my DVD drive, Toshiba SD-M1502 and it refused to recognize the disc at all. So, I guess what I am asking is, Does anyone know if my toshiba drive is capable of reading a 90Minute CD?

[gNOMEintheRedHat]

Have you successfuly played a standard VCD in the player?

My Toshiba will not read ANY CD-R or RW.

gNOME

[snowmoon]

I think you may have answered your own question....

Yes some toshibas can read cd-r and cd-rw

[Reggie]

Yes, I have tried other SVCD's on CDR and CDRW in this Toshiba drive and it plays them back flawlessly. It's got nothing to do with it being a CDR, but everything to do with the size of the disc (90Minutes!)

I have tried another burn with 85Minutes worth of data on a 90 minute CDR and it works fine, So, I'm not sure why it won't work.

[Reggie]

Yes, I have tried other SVCD's on CDR and CDRW in this Toshiba drive and it plays them back flawlessly. It's got nothing to do with it being a CDR, but everything to do with the size of the disc (90Minutes!)

I have tried another burn with 85Minutes worth of data on a 90 minute CDR and it works fine, So, I'm not sure why it won't work.

[snowmoon]

Reggie, the reason why it won't work is the TOC. TOC is always stored at the END of the disk. If your DVD player does not support seeking past 85 minutes it will never be able to read the TOC. So you player can support the pitch of the 90 minte disks, but has an artificial limit on the absolute higest sector number it can seek to.

[Reggie]

OK, snowmoon, I thought TOC was written as part of the lead in stage? It's cool if I'm wrong. The reason I thought this was because doing one of my overburns failed in the leadout where the TOC is, but the disc was still readable in the DVD drive. I have a few files to encode, so I'll do them to 86 mins, 87, 88 etc. until I find the limit of the drive.

I don't understand this either, if the disc is the same size as an 80 minute CD, both 80 and 90 minute CD's can be burnt to the edge, so it is possible that the laser can move that far up the disc to the full 90? I am presuming that it is the tightness of the data 'spiral' that gives the extra length to the disc?

If it can read up to 85+ the TOC that means it can read up to 86:30, doesn't it? and I already know that it can read a disc with a failed leadout in the toshiba.


I emailed toshiba, and they said it shouldn't be able to read the 85 minute CD but it does, so here's hoping that I can get a few more minutes out of it.

[snowmoon]

it's toc then leadout. The TOC is at the end to support multi-session as the drives just read the last one. The leadout is in the specs, but can usually be screwed without any ill effect.

It has nothing to do with how far the laser can track out, as you point out, it should be able to go much further. It's more a matter of addressing, as the firmare on the DVD-ROM drive does not expect to ever have to address those sectors. Those sectors should be WAY off the side of the disk if it were standards compliant.

[Reggie]

"Those sectors should be WAY off the side of the disk if it were standards compliant"

I totally agree. As far as Toshiba are concerned I have already got it to read 5 minutes more than they expected, so I am lucky in that respect.

I thought in DAO mode the TOC is written first, and isn't multisession? I never see it written at the end, but then again, I never look out for it so that is probably why.

I have another question, let's hope you can understand it


In nero you are supposed to tell it how big the disc is in the advanced/overburn options. I presume that this is to tell the CDRW how tight it has to write the data to fit it onto the CD?

Both the 88 minute file and the 85 minute file were both setup the same way, so the data should be wound as tight on both discs shouldn't they, I am thinking this because the 85min file left a ring of unburnt disc? if that is the case, as the DVD can read the 85 it can obviously read the data written that tightly together?

I'm not disputing you at all snowmoon, I'm just curious as to what I am seeing happening and the way it is all presenting itself as I experiment, I mean, I find it fantastic that I can even write 90mins worth of data to a disc.

Thanks for all of your help snowmoon, it's been helpful