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Question about 830 mb blank CDs

jimdagys posted 2009 May 31 18:13

I saw in the store 720 mb and even 830 mb blank Cds. I don't understand how this can be since the outside diameter of the plastic disk is fixed to a standard. Can someone please explain this.

MOVIEGEEK posted 2009 May 31 18:39

The spaces between the data is narrower. Ritek made 90min and 99min CD-R but they are hard to find nowadays,most writers and players supported the 90min CD-R's but the 99min ones were a crap shoot because of the high tolerances required.

jimdagys posted 2009 May 31 19:03

I thought the foil (data part) of the cd is homogenious and didn't contain any tracks until it is burned. So I don't see how the "data can be narrower".

MOVIEGEEK posted 2009 May 31 19:50

The writer makes the data narrower but you have to enable "overburning" in the burn program.Nero was(is?) able to overburn to 99min and so was Fireburner.You can also use 80min CD-R's to burn 780MB by using mode 2.

AlanHK posted 2009 May 31 19:55

jimdagys : I thought the foil (data part) of the cd is homogenious and didn't contain any tracks until it is burned. So I don't see how the "data can be narrower". http://www.pctechguide.com/33CDR-RW_Disc_capacities.htm : CD-R's have a pre-formed spiral track, with each sector address hard-coded into the media itself.

AlanHK posted 2009 May 31 19:59

MOVIEGEEK : The writer makes the data narrower but you have to enable "overburning" in the burn program.Nero was(is?) able to overburn to 99min and so was Fireburner.You can also use 80min CD-R's to burn 780MB by using mode 2. "Overburning" is not done by making the track narrower, that can't be changed on a CDR blank at all. It just burns closer to the outside edge. http://www.pctechguide.com/33CDR-RW_Overburning.htm : Overburning, also known as oversizing, is basically writing more audio or data to CD than its official capacity by utilising the area reserved for the lead-out and perhaps even a few blocks beyond that.

MOVIEGEEK posted 2009 May 31 21:53

This article explains the problems with 90/99min CD-R: http://www.feurio.com/English/faq/faq_writer_99mincdr.shtml : Apart from the track which is inevitably too narrow on 99 minute CD-Rs (And thus the problem that many CD players can't even find the track and thus when playing the CD back may "jump") there are several much more serious problems:

AlanHK posted 2009 May 31 22:36

MOVIEGEEK : Ritek made 90min and 99min CD-R but they are hard to find nowadays,most writers and players supported the 90min CD-R's but the 99min ones were a crap shoot because of the high tolerances required. I bought "100 min/900 MB" CDRs here, brand was "Sky Pro" if that means anything. Never used them to full capacity, but the CDs I did burn were readable.

hech54 posted 2009 Jun 01 00:24

I use the TDK 800BM/90 minute discs quite often. Burn to damn near full and they play in everything I've ever tried them in. LG Burners, Prassi Ones, and oversized media.....can't beat it. :)

Onceler2 posted 2009 Jun 09 09:42

I bought sky pro 99min cdrs that worked great for audio cd and vcd but if you burned them as data cds they would be partially unreadable

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