Universal Disk Format
Now there is a packet writing - which has two different flavors. The idea of writing packages is that if you do not worry about the TOC, you can write data to CD-R in the form of blocks or packets. The information that goes into each packet needs to be accessible by the writer, but not necessarily by an ordinary reader. When writing an appropriate set of functions in the heart of OS - at about extensions for DOS - the supplier can provide the set of opportunities for writers with the appropriate hardware and firmware. However, there is no TOC at Level 1 or Level 3 sense that the information on the disk and in other ways. This requires additional space on disk and indicates that the data should be interpreted when UDF disc inserted in the drive.
The ASPI Layer
In the early days of CD-ROM, every manufacturer had his own interface and connections to the host. Standard interfaces, ASPI and CAM (which will operate ASPI devices and is functionally equivalent for Windows platforms) were devised and manufacturers of SCSI devices either conformed or wandered out of the market. The situation with IDE devices was similar, but the standard that was developed for them (ATAPI) made them look to the system like SCSI and allowed them to work through ASPI. For that reason, your computer's IDE adapter and devices may show up under the SCSI controls.