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When only a single recording session (lead in/data/lead out) is to be recorded onto a 
disk, it is called “Disc-At-Once”. 

When using Disc-At-Once, no additional data can be recorded onto the disc, even if 
there is available capacity. 

The advantage of this method recording is that it enables creation of discs that can be 
played back on almost any CD player or CD-ROM drive, because there are no links 
inserted between the data tracks. 

When many sessions are to be recorded onto a disc, it is called “Track-At-Once”. If 
there is space available on the disc, additional data can be recorded onto it. 

The advantages of this method include being able to record additional sessions onto 
a disc, and using a CD-ROM of backup data. (Refer to “Multi-session”.) 

Session-At-Once 
A "Session-at-Once" recording almost corresponds to a "Disc-at-Once recording", i.e. 
all data ("Lead-in", data area and "Lead-out" are written in one go.   
The only difference is that the CD is not "finished", i.e. after a "Session-at-Once" 
recording you still have the possibility to write a further "Session" on the CD at a later 
date. 

The recording of lead-in/data/lead-out is referred to as one session. The 
Disc-At-Once method is also referred to as “Single Session”, because the disc is only 
recorded once. A disc that has had multiple additional session recorded onto it using 
the Track-At-Once method is called “Multi-session”. 

The Packet Write recording method was developed. It differs from Track-At-Once or 
Disc-At-Once in that data is recorded in small fixed sectors of 64k bytes, known as 
packets. 

The advantages of this method are elimination in overhead per session and the 
elimination of buffer under run errors. This method, however, cannot be utilized for 
audio data. A number of formats, such as UDF and CD-R FS, can be used when 
recording using the Packet Write method. 

 

 

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