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(i) DVD. Despite being the same physical size, a DVD can hold more data than a CD. To achieve this, a more tightly packed spiral track is used to store the data on the disc. To accurately access the smaller 'bumps', a finer red laser is used in a DVD drive than that found in a standard CD drive.
(ii) Read-only memory (ROM) is a type of non-volatile memory used in computers and other electronic devices. Data stored in ROM cannot be electronically modified after the manufacture of the memory device.
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