To give you an impression about partition in advance. Generally, a disk is always been divided into several part, each part is called partition. It is very useful to divide hard disk into several partitions, since each partition will work like a separate disk drive, you can use it for storing different categories of different data without confusion. What's more when one partition corrupted the others will not be affected.
So then what is the principium, what make it be recognized as a partition by system? The answer is all these are depends on partition table. If partition table is destroyed by virus or deleted accidentally, you will not see the partition you need. But actually the data has not been destroyed after the partition lost. You can recover partition with Partition Recovery Wizard built in Partition Assistant.
Step 2: Choose search mode.
Step3: Partition Recovery Wizard will search deleted or lost partitions on the selected disk. Once a deleted partition is found, it will be displayed in the list box (You can double click the partition to explore the content to see whether it is the one you want to recover). Select the partitions you want to recover and click "Proceed" to continue.
If you use Fast search mode and Partition Recovery Wizard cannot find the deleted or lost partitions, you can choose Full search mode to try
Step 4: After the partition recovery completed, the lost or delete partitions have been recovered.