By PURPLELEC | 25 September 2023 | 0 Comments
What are the storage devices?
In the rapidly developing information age, people are transmitting, storing, and sharing data more and more frequently, and various data storage devices are constantly emerging. So, what are the common storage devices? How to choose removable storage devices?
Next, the editor will briefly introduce the classification of storage devices, and focus on sharing the key points for purchasing four commonly used removable storage devices: mobile hard drives, USB flash drives, memory cards, and optical discs to help everyone easily choose the right storage device.
What are the storage devices?
The so-called storage device is usually a device that digitizes information and then stores it using electrical, magnetic or optical media. There are mainly the following four categories: 1. Storage using electrical energy: such as RAM, ROM and other memories; 2. Storage using magnetic energy: hard drives, tapes, U disks, etc.; 3. Storage using optical methods: CD or DVD; 4. Storage using magnetic energy. Optical storage: such as magneto-optical disk. However, in daily life, removable storage devices are the most commonly used. Let’s take a look at how to choose among the four most commonly used removable storage devices.
1. Mobile hard disk
A mobile hard disk is a storage product that uses a hard disk as a storage medium to exchange large-capacity data with a computer and emphasizes portability. Interfaces with faster transmission speeds such as USB and IEEE1394 are often used to transmit data to the system at a higher speed.
Key points for purchasing:
1. Capacity size, the mainstream market is 500GB and above, the larger the capacity, the higher the price;
2. Size: The 2.5-inch mobile hard drive box is small in size, light in weight, easy to carry, and generally does not have an external power supply.
3. Transmission speed. The reading speed of mainstream 2.5-inch mobile hard disk is about 50-100MB/s, and the writing speed is about 30-80MB/s.
2. U disk
U disk, the full name of USB flash disk, is a miniature high-capacity mobile storage product that uses a USB interface and does not require a physical drive. It is connected to the computer through the USB interface to achieve plug-and-play. It has the characteristics of compactness, portability, large storage capacity, and low price.
Key points for purchasing:
1. The capacity of mainstream U disks is 8GB and above. The larger the capacity, the higher the price;
2. For students or ordinary users who only need to store and transfer general documents and pictures, it is enough to choose an ordinary U disk;
3. For business office or special purposes, you can choose some USB flash drives with special functions such as encryption, backup, and cloud storage.
3. Memory card
Memory card is an independent storage medium used in mobile phones, digital cameras, portable computers, MP3 and other digital products. It is generally in the form of a card. There are four main types: TF (mobile phone) card, SD (camera) card, CF ( SLR) card, XQD card/memory stick.
Key points for purchasing:
1. Generally, the larger the storage capacity, the slower the access speed. It is best to buy according to the capacity that you can frequently use.
2. Pay attention to compatibility, especially with digital cameras. It is best to take the machine to try it out in person, or find the corresponding memory card model.
3. When purchasing, the editor recommends that it is best to choose well-known brands, and do not be greedy for cheap prices. Inferior memory cards may have security risks.
4. CD
An optical disc is an item that uses optical information as a storage medium and is used to store data. There are two main types: one is non-rewritable optical discs, such as CD-ROM, DVD-ROM, etc.; the other is rewritable optical discs, such as CD-RW, DVD-RAM, etc.
Key points for purchasing:
1. Most people burn infrequently and do not need to pursue high writing speeds. CD-RWs with high-speed reading and 4-speed writing or 2-speed and 4-speed erasing are preferred.
2. Large-capacity buffering can ensure that recording will not stop when data transmission is paused for a short period of time. You should choose a product with a larger buffering capacity, usually between 512kb and 2mb.
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