What are two ways in which a hard disk and CD ROM are different?

A hard disk is a magnetic storage medium that allows for random access to data, making it suitable for high-speed data retrieval and storage, while a CD-ROM is an optical storage medium that uses laser technology to read data and typically has slower access times. Additionally, hard disks offer significantly larger storage capacities compared to CD-ROMs, which generally hold up to 700 MB of data. Furthermore, hard disks are rewriteable and can be used for frequent data updates, whereas CD-ROMs are usually read-only once they are burned.