Difference amongst primary and secondary storage device
Describe difference amongst primary and secondary storage device?
Expert
In primary storage device the storage capacity is restricted. It contains a volatile memory. In secondary storage device the storage capacity is large. It is a non-volatile memory. Primary devices: RAM / ROM. Secondary devices: Floppy disc / Hard disk.
Primary storage device is Ram in which the instructions are hold for temporary & secondary storage is hard disk floppy cds etc.
Working of Virtual Memory: Virtual memory is similar to a temporary storage area. It comprises of page table. In this pages are classified into frames. This is a continuous memory allocation. It is also termed as logical memory.  
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