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Storage Devices - Coggle Diagram
Storage Devices
Hard Disc Drives
Hard disc drives (HDDs) are commonly used as the primary storage devices in a computer system, particularly servers and desktop computers.
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HDDs are a form of magnetic storage. They consist of several discs made of magnetic material called platters.
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Because computers store all data in 1s or 0s (known as binary), we can store our data this way: a magnetised area represents a 1, and a demagnetised area represents a 0.
They are available in larger capacities, making them suitable for storing vast quantities of data, such as extensive media libraries or backup archives.
HDDs offer higher storage capacity for a lower cost than SSDs.This makes them an option for users requiring large amounts of storage without a high price tag.
Due to their mechanical parts, HDDs have slower read/write speeds than SSDs.This can result in longer computer boot times and slower file transfer rates.
HDDs work with most computers and devices using standard connections like SATA or USB, so they are easy to use with desktops, laptops, and external storage cases.
Solid State Drives
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However, they are also commonly used as the primary storage device in laptops and, recently, desktop computers.
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These chips can be switched to either an “on” or “off” state. The “on” state represents a 1, and the “off” state represents a 0.
This storage device stores data much the same way as your computer’s RAM, except the solid-state drive will remember the data even after the computer is turned off.
While SSD capacities are increasing, they are typically lower than HDDs in the same price range, potentially limiting their use for large data storage requirements.
SSDs are more expensive per gigabyte than HDDs, making them less cost-effective for users needing high storage capacities.
SSDs provide significantly faster data access and read/write speeds than HDDs.This results in quicker boot times, faster file transfers, and improved system responsiveness.
SSDs work with most modern computers and laptops. Some SSDs need special slots, which might not be available on older devices.
Optical Discs
CDs, DVDs and Blu-Ray discs are all examples of optical discs.
They’re most commonly used for storing music, films, TV, and software for distribution by suppliers (e.g., game publishers distribute games on disc to retail stores for sale).
These different types of discs are a form of optical storage that uses a laser to mark the disks in a pattern.
A light is then bounced off the disk and is read back differently depending on whether the light bounces off a marked or non-marked area.
Marked areas are known as “pits” and represent 0s in binary; non-marked areas are known as “lands” and represent 1s in binary.
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Optical discs are very cheap per disc, especially for CDs and DVDs, making them an affordable option for one-time storage. However, the cost can add up for larger collections, and the drives needed to read or write them can be expensive.
Optical discs are slower than most modern storage devices. Writing data to a disc (burning) takes time, and reading data is also much slower compared to USB flash drives or SSDs.
Optical discs require a disc drive to use, which is becoming less common on modern laptops and desktops. They are still widely compatible with older devices and dedicated players like DVD or Blu-ray players.
USB Flash Drives
USB flash drive devices involve a USB connector and flash memory in order to store data with portability in mind.
They are commonly used for transferring data between different computers, as well as to back up our files.
USB flash drives use flash storage, much like SSDs, and so they store data the same way.
USB flash drives come in a range of sizes, from a few gigabytes to over 1TB, making them useful for storing and transferring files like documents, photos, and videos. However, their capacity is generally smaller than HDDs and SSDs.
USB flash drives are relatively affordable for smaller capacities, but the cost per gigabyte increases significantly for larger ones, making them less economical for large storage needs.
The speed of a USB flash drive depends on its type. USB 3.0 and 3.1 drives are much faster than older USB 2.0 versions, but even the fastest USB drives are slower than most SSDs.
USB flash drives can be used with almost any device with a USB port, making them incredibly versatile for storage, data transfer, and backup purposes.
SD Cards
Short for “Secure Digital Card”, this is a very small memory card that is used commonly in digital cameras, as well as in mobile devices like smartphones.
This is because they’re small enough to fit inside these portable devices while still being removable for transferring data.
Again, like USB flash drives and SSDs, SD cards use flash memory and so store data in the same way.
SD cards are available in various sizes, typically ranging from 16GB to 1TB. They are ideal for storing photos, videos, and files in portable devices like cameras and smartphones, but their capacity is limited compared to HDDs and SSDs.
SD cards are affordable for smaller sizes, but higher-capacity cards can become quite expensive, especially high-speed models designed for tasks like 4K video recording.
The speed of an SD card varies by its class and type. High-speed cards like UHS-II or UHS-III are faster but still slower than SSDs, making them suitable for tasks like recording HD video but not for high-performance computing.
SD cards are commonly used in devices like cameras, smartphones, and tablets. They require an SD card slot, so older or non-compatible devices may need an adapter to use them.