Find data in memory via sequential or direct access. Both access methods work. How is direct access to today's trendiest technology feasible, and what are the benefits? How can we update data in a device that only allows sequential access?

HDDs, RAM, SSDs, and cache memory are all types of digital memory. These are in computers. Is there an advantage to having many standards, or would it be better for consumers if there was only one memory standard, like SSD sizes? Is it beneficial to have several standards? Would consumers benefit from one standard?

The data kept in memory may be accessed in one of two ways: sequentially or instantly. Why has direct access spread so widely? How may a device that previously only permitted sequential access be changed to allow direct access?

How does in-memory processing like Spark differ from traditional disk-based processing systems?