Microtest VIRTUAL CD v3 manual Overview of copy methods

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with the Standard copy method used by Virtual CD. This is why we have introduced 2 new options, called Correction 1 and Correction 2. In most cases, one of these copy methods will be able to create your virtual CD. Unfortunately, there is no way to know ahead of time which method you need to use; only trial and error will tell you. Theoretically, "Correction 2" is the most advanced method, but it also has its disadvantages.

Overview of copy methods:

Method	Advantages	Disadvantages
Standard	• Fastest method	Does not work with all CDs
	• Data can be compressed
Correction 1	• Relatively fast	CD may not work
	• Data may be compressible
		• Relatively slow
Correction 2	Can copy almost any CD	• Data cannot be compressed
		• Not compatible with all CD drives
		• Not supported in Windows 2000

To save space on your hard disk, select a Data compression method to reduce the size of your vir- tual CD. It is difficult to say exactly how much space can be saved in a given case; Virtual CD gives you a rough estimate when you select a compression method. When you use the Correction 2 copy method, data cannot be compressed and this option is automatically deactivated.

With Correction 1, data compression may actually result in the data volume being enlarged rather reduced, so we recommend de-activating the compression for this copy method as well.

If the estimate given indicates only a slight reduction in data volume, it's best not to use data com- pression at all (select None). This is because data compression uses up processor capacity not only when you create the virtual CD but also every time you access it, which can slow things down con- siderably, especially in older systems with processors that operate at <150 MHz or slower.

The option to Ignore defective sectors is useful if your source CD was created with defective sec- tors. This option should only be activated if attempts to create a virtual CD without this option have already failed. With the Correction 1 and Correction 2 copy methods, this option has no effect and is automatically de-activated.

Click on Next to continue.

The next window only opens if the source CD contains audio data. If the source is purely a data CD, this and the next window are not shown, so you can skip the next page or two of these instructions.