FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Common direct access storage devices include solid-state drives (SSDs) and hard disk drives (HDDs). Direct access storage devices include RAID arrays like the one pictured here, hard disk drives, solid state drives, systems like magnetic drums and data cells, optical discs and PC storage devices.

Detailed explanation-2: -Random-access devices include hard drives, CD (compact disc) writers, and DVD (digital versatile disc) RAM (random-access memory) devices. The hard drive typically has a storage capacity of 20 gigabytes (GB) and a data transfer rate of over 10 megabytes (MB) per second.

Detailed explanation-3: -1. Sequential access media-which store records sequentially, one after the other. 2. Direct access storage devices (DASD)-which can store either sequential or direct access files.

Detailed explanation-4: -Random access (more precisely and more generally called direct access) is the ability to access an arbitrary element of a sequence in equal time or any datum from a population of addressable elements roughly as easily and efficiently as any other, no matter how many elements may be in the set.