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Advantages: 
! 

'On-the-fly' copying is quicker as 'Image copying' because you can start the 
burning process without having to wait for the end of the reading procedure. 

! 

 No hard disk memory is needed for the copy. 

Disadvantages: 
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If the CD is scratched or if errors occur during reading, the reading speed 
will drop and with it the transfer rate, so that a buffer under-run may occur. 

 

You should only use the 'On-the-fly' copy feature if (for example) you have no 
hard drive memory available for an image. Note: making a copy via an image 
file is always much safer. 

In the case of an image copy (unlike an 'on-the-fly' copy) the CD is first 
completely read and then an image of the CD is created on the hard disk. The 
burning process is only started after the image has been completed. 

Advantages: 
! 

You will not have a 'burned' blank CD if any problems occur when reading 
and/or if the reading speed of the drive is temporarily reduced.  

! 

There are no 'conflicts' between the CD-ROM drive and CD writer drive. (In 
particular with IDE CD writers / CD-ROM drives.) 

! 

Many CD-ROMs only supply correct data while reading continuously; this is 
the case with an image copy. 

! 

The image can be used for additional writing if it is not deleted, i.e. further 
copies can be burned without the source CD having to be present. 

Disadvantages: 
! 

The burning process takes longer because an image first has to be created 
and then burned.  

! 

With a 70 minute CD, around 650 MB of hard disk memory is needed for 
filing the image.