PRIMARY STORAGE                                     Primary storage is smaller in capacity               Primary storage is expensive and smallerExample : RAM, L2 Cache
SECONDARY STORAGESecondary storage is bigger capacity
Secondary storage is usually cheaper and large
Example : Hard Drive, CD-ROM

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PRIMARY STORAGE DEVICE refers to the internal memory of a device like RAM in laptops and computers. They are volatile and non volatile while SECONDARY STORAGE DEVICE refers to an external memory which can be attached to the device like pendrives, SD cards etc. as they can be attached to laptops or computers. They are non volatile.