Last updated: October 15, 2021

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Nowadays we all have a lot of files and information stored on our computers. There are so many that, many times, we occupy all the space available on our computers without realising it. Thanks to SD cards we can save this information and free up the internal memory of our devices.

For this reason, we are interested in providing you with all the necessary information so that you can choose the SD card that suits you best. We won't stop with the technical details; we'll go further and show you all the elements to take into account so that you can choose the best SD card for you.




Summary

  • An SD card is a small device that can be used to store information on devices such as mobile phones, digital cameras or tablets.
  • SD stands for Secure Digital. They are an evolution of the old MMC cards. The storage capacity of these cards varies and ranges from 2 GB to 2 TB.
  • They are frequently used in devices such as cameras or video cameras, smartphones, video game consoles, tablets, among others, depending on the type of card.

The Best SD Cards: Our Picks

Buying Guide: What you need to know about SD Cards

An SD card is a small device that allows you to store information on devices such as mobile phones, digital cameras or tablets. (Photo: photochicken/ 123rf.com)

What are SD cards?

SD cards are portable storage devices for digital data. The storage capacity of SD cards varies, ranging from 2 GB to 2 TB. They are typically used in devices such as cameras and tablets; while mini SD and micro SD cards are intended for smaller devices such as smartphones, game consoles, music players, among others.

The market offers several types of SD cards, with 3 models being the most commonly used. SD cards are 32 x 24 x 24 x 2.1 mm and weigh approximately 2 grams; mini SD cards are 21.5 x 20 x 1.4 mm and weigh 0.8 grams and micro SD cards are 15 x 11 x 1 mm and weigh just 0.25 grams.

Currently, there are several models of SD cards to suit the needs of users. Depending on the type and storage capacity, the cost will vary.

What are the benefits of an SD card?

SD cards provide several benefits to users. One of them is mobility. Because they are so small, they fit in a pocket and can carry a large amount of data. They also provide a large amount of storage space, of course, depending on their capacity.

Another factor to consider is their practicality. Nowadays almost everyone stores their data in the cloud, but to access it we depend on an internet connection. With SD cards, on the other hand, all we need is a card reader.

Advantages
  • They provide a large storage capacity
  • they are easy to carry
  • you only need a reader to access your data
Disadvantages
  • Although they are reliable, there is always a risk of data loss due to a malfunction

SD Card Busen Classes and Speed - What should you pay attention to?

In the world of SD cards there is such a thing as "classes". Classes determine the speed at which files can be saved. Currently there are 7 classes: Class 2, 4, 6, 10, 30, 60 and 90. Each number determines the amount of data that can be saved per second.

Class Minimum speed Applications
Class 2 2 MB/s Standard photos and videos
Class 4 4 MB/s Records HD video (720P up to 1080P/1080I)
Class 6 6 MB/s Records HD video (720P up to 1080P/1080I)
Class 10 10 MB/s Record FULL HD video (1080I) and HD photos (Ultra High Speed Bus)
UHS CLASS 1 (U1) 10 MB/s Real-time recording and long HD videos (Ultra High Speed Bus)
UHS Class 3 (U3) 30 MB/s 4K resolution files (Ultra High Speed Bus)

Another factor to consider, in addition to the class, when choosing an SD card is the speed at which information is sent between the computer and the card. This is called Bus Speed.

SD cards that are class 6 or lower have a standard bus. From class 10 onwards we talk about High Speed Bus or Ultra High Speed Bus (UHS-1 and UHS-II). Ultra High Speed cards can be class U1 or U3, the latter being ideal for 4K quality video.

They are frequently used in devices such as cameras, video cameras, smartphones, video game consoles, tablets, among others, depending on the type of card. (Photo: Stanisic Vladimir/ 123rf.com)

Purchasing criteria

When we see an SD card we only ask ourselves what is its capacity without paying attention to the other features it has. At ReviewBox we want you to know what you should consider when buying an SD card.

Compatibility

The first thing you should do before going out to buy an SD card is to check what type of card your computer supports. To do this you should check the features of your device and verify the compatibility it has with SD cards.

It is likely that, depending on the specifications, you won't have to buy the most expensive card and a mid-range card will do.

SD stands for Secure Digital. They are an evolution of the old MMC cards. The storage capacity of these cards varies and ranges from 2 GB to 2 TB. (Photo: ronstik/ 123rf.com)

Speed

SD cards have different speeds, both for writing and transmitting data, and depending on how demanding you are going to be on your computer, it is important to choose a model according to your needs.

If you use a card with a slow speed, you run the risk of it not having the capacity to store the information at the rate you want it to, and it may end up saturating.

It is best to buy SD cards from class 6 and upwards. In this way, we can be sure that we have a good device to transmit and store information at a good rate.

Storage capacity

Knowing what you are going to use your SD card for will determine the capacity you need. If you need to store large amounts of data, a 256GB card is likely to be the best choice. On the other hand, if you only need to store a small amount of material, a 32GB card will suffice as an option.

(Featured image photo: Vassiliy Prikhodko/ 123rf.com)

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