Computer Storage Devices - ComputerWork22
Storage Devices
What is a storage device?
Storage devices are the pc hardware accustomed to remembering/storing knowledge.
There are many varieties of storage devices, every with its own edges and disadvantages.
Hard Disk Drive (HDD)
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What is a hard disk drive?
The read/write head is then capable of detecting the magnetic charges left on the disk’s surface, this can be however information is scanned.
Benefits of hard disk drives
- Capable of holding huge amounts of knowledge at reasonable costs
- Fast browse and write speeds
- Reliable technology
- Relatively tiny in size
Drawbacks of hard disk drives
- Due to the character of its moving elements, they're going to eventually wear and break
- Although in no time, anticipating the moving elements means that it'll ne'er perform as quick as solid-state drives
- More fragile and less sturdy than a solid-state drive
- Higher power consumption than an SSD
Solid State Drive (SSD)
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This expense means typical capacities square measure sometimes measured in Gigabytes (GB).
- Extremely quick read/write speeds
- Small in physical size and really light-weight, ideal for moveable devices
- No moving elements to wear, fail, or get broken – ideal for creating moveable computers and devices additional reliable and sturdy.
Random Access Memory (RAM)
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What is RAM?
RAM may be a computer’s primary memory. it's a really quick solid-state data-storage medium that's directly accessible by electronic equipment.
Any open programs or files on a pc are quickly held on in RAM while being employed.
Being volatile, any information that holds on in RAM is lost once power is removed. This makes RAM entirely unsuitable for the long-run permanent storage of information – that's the role of an HDD or SSD instead.
Benefits of RAM
- Directly accessible to the hardware, creating process knowledge quicker
- Fast solid-state storage, creating process knowledge quickly
Topics / Hardware / Storage Devices
Storage Devices
What is a storage device?
Storage devices are the computer hardware used to remember/store data.
Below are explanations about different storage devices.
- Hard Disk Drive (HDD)
- Solid State Drive
- Random Access Memory (RAM)
- CD, DVD, and Blu-ray Discs
- DVD-RAM
- ROM
- USB Flash Memory
Hard Disk Drive (HDD)
Hard Disk Drive Storage Device - GCSEWhat is a hard disk drive?
Hard disk drives are non-volatile magnetic storage devices capable of remembering vast amounts of data. An electromagnet in the read/write head changes the disk’s surface with either a positive or negative charge, this is how binary 1 or 0 is represented.
The read/write head is then capable of detecting the magnetic charges left on the disk’s surface, this is how data is read. Typical HDD capacities are measured in Terabytes (TB).
Typical applications for hard disk drives
- Desktop computers
- Laptop computers
- TV and satellite recorders
- Servers and mainframes
- Portable (external) drives are sometimes used to backup home computers or transfer large files
- Benefits of hard disk drives
- Although very fast, waiting for the moving parts means it will never perform as fast as solid-state drives
- More fragile and less robust than a solid-state drive
What is a solid-state drive?
Solid-state drives are non-volatile storage devices capable of holding large amounts of data. They use NAND flash memories (millions of transistors wired in a series on a circuit board), giving them the advantage of having no mechanical moving parts and therefore immediate access to the data.
Solid-state drives perform faster than traditional hard disk drives, however, they are significantly more expensive.
They can be installed inside a computer or purchased in a portable (external) format.
Until we reach a point where large-capacity SSDs are affordable, a compromise is to run two disk drives inside a computer. An SSD as the primary drive for your important programs and operating system, and a traditional HDD to store music, documents, and pictures (which don’t need the faster access times).
Random Access Memory (RAM)
RAM is a computer’s primary memory. It is a very fast solid-state storage medium that is directly accessible by the CPU. Being volatile, any data stored in RAM will be lost when power is removed. This makes RAM totally unsuitable for the long-term permanent storage of data – that is the role of an HDD or SSD instead.
Data is copied from secondary storage (HDD, SSD) to RAM as and when it is needed. This is because using an HDD as the primary memory would cause a computer to perform much slower (an HDD or SSD is not directly accessible to the CPU, and isn’t as fast as RAM).
RAM is a relatively expensive storage device.
Computers operating with a capacity of RAM above the recommended minimum will benefit from better performance and multitasking.
There are two types of RAM (SRAM and DRAM), each with its own advantages and disadvantages.
Benefits of RAM
- Directly accessible to the CPU, making processing data faster
- Fast solid-state storage, making processing data faster
Drawbacks of RAM
- Relatively expensive memory
- Volatile – any data stored in RAM is lost when power is removed.
Static RAM (SRAM)
- Data on SRAM doesn't need refreshing.
- However, the technology is bulkier which means less memory per chip.
- More expensive than DRAM
- Much quicker than DRAM
- Consumes less power
Dynamic RAM (DRAM)
The data must be frequently invigorated otherwise it fades away.
Continually refreshing the information takes time and reduces performance speeds.
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