I was loooking for some soft that allows to reduce the logical sector size,and increase cd-r capacity.
I mean if the cd-r capacity is 650 MB i'd like to record 1.2 GB aprox.
I know it is possible, 'cozz some microsoft cd's come this way ex.WIN NT 4.0 (800 MB) in 650 MB format, and the the logical sector was less than 2048 Bytes.

Thanx for all

i Hope you can help me.

There are pressed discs such as the GDROM's that DC Games use that do contain over 700 MB. But they are manufactured with a tighter groove & spiral. There is not to my knowledge and way to achieve this with a CDR, nor do I think it's possible to do so and retain any reliability.