I just burned a CD-R but I did not use all the data/space in it. I left about 2 minutes of music unused. After burning, I checked the CD-R and found that it was full. When I tried to burn to it, it says:
Please insert a blank CD-R.
What happened to all the data/space on the CD-R that I had not used?
When you start recording a CD-R you open a session and when the recording ends, the disc is "closed" meaning no more data can be added to the CD-R. The unused space is unavailable and "invisible" for the player.
Your burner software must have a "multisession" option that let you record a session and keep the unused space available for a new session.
During the late 90s and early 2000s, some record labels sold multisession CDs, one having the audio tracks and other with video and multimedia content.
Yes, you can see the written parts of the disc if you put it under dimmer light. Being that the laser writes from the inner to the outer edge, you will see that a written disc of say,680megs of data will then change visually as a slightly darker color of the disc. ( green,red,blue cd-r's exists) That outer "non written" sliver will be seen with your eye if you rotate the disc just so. The next question is: With all of those half written discs that you've done over the years,... would there exist at this point, a program that could just make a non iso standard disc that re-uses all of those discs by writing another table of contents and additional data to the empty part... the part that could still take a burning laser. Just saying... ( per the environmental guy in me)
