Storage devices
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Storage devices are used to store data and information in a computer. There are two main types: primary and secondary storage. Primary storage includes RAM, ROM, and cache, which can be directly accessed by the CPU. RAM is used as the computer's main memory and comes in DRAM and SRAM varieties. ROM is used to store basic startup instructions and cannot be modified. Cache provides faster access to frequently used data. Secondary storage includes hard disks, which are not directly accessible by the CPU and require transferring data through primary storage. Hard disks are computers' main storage and come in internal and external varieties.
Storage devices
- 2. Content
- 3. What is Storage Device means? A storage device is used in the computer to store data and information. It provides one of the core functions of the modern computer.
- 4. Types of Storage Devices
- 5. Primary Storage Also known as main memory Main memory is directly or indirectly connected to the CPU via a memory bus. Example: RAM ROM Cache
- 6. RAM(Random Access Memory) Any of the data in RAM can be accessed just as fast as any of the other data. There are two types of RAM: DRAM(Dynamic Random Access Memory) SRAM(Static Random Access Memory)
- 7. Types of RAM Static RAM Dynamic RAM • Faster • More expensive • More power consumption • Does not need to be refreshed. • Slower • Less expensive • Less power consumption • Need to be refreshed.
- 8. ROM This memory is used as the computer begins to boot up. Small program called firmware are often stored in ROM chips on hardware devices(like BIOS chip),and they contain instruction the computer can use in performing some of the most basic operations required to operate hardware devices. ROM memory cannot be easily or quickly overwritten or modified.
- 9. Cache Cache is a high-speed access area that can be either a reserved section of main memory or a storage device. Most computers today come with L3 cache or L2 cache, while older computers included only L1 cache.
- 10. Secondary Storage It is not directly accessible by the CPU. Computer usually uses its input/output channels to access secondary storage and transfers the desired data using intermediate area in primary storage. Example: Hard Disk
- 11. Hard Disk The hard disk is the main, and usually largest, data storage device in a computer. Hard disk speed is the speed at which content can be read and written on a hard disk. Disk access time is measured in milliseconds.
- 12. Types of Hard Disk Internal Hard Disk External Hard Disk Portability No Yes Price Less expensive More expensive Speed Fast Slow Size Big Small
- 13. Any Questions ?
- 14. Thank you !!