SD Card Full Form – What is Secure Digital (SD)? 2024

I know you also want to know SD card full form. Many of us use SD card on our smartphones to store data. And not only on our mobile Phones.

We use SD cards on many other devices also such as cameras. laptop, and in many other devices also.

SD card full form

SD card is used by many people but there are very few people who know the full form of SD card and what is SD card?

So if you are also one of those people then don’t worry because I am here today to answer all these questions.

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SD Card Full Form

Full form of the SD card is Secure Digital Card. This is one of the storage type devices. This was invented in August 1999 by joint efforts between SanDisk, Panasonic, and Toshiba.

Many people think that SD card stands for Storage device but it is not the real full form of SD card The real full form of SD card is Secure Digital Card.

As you can guess by its name this SD card is a secure way to store our data and other is very less chances of losing our data.

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What is an SD Card?

A secure Digital Card (SD) card is a storage device we can use SD cards to store aur data. Many times aur phone storage get filled with many important stuffs and the storage of our phone gets over.

What is an sd card

So in those case we can use SD card to increase the storage of our Phone and other than this also there are many other uses also such as without SD card we can’t save clicked photos in our camera.

So Sd card is one fo the mot important device that we can we use to store our data. SD card is one of the best and secure options to store our data. And because of this many people use this to store their important data.

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What are the types of SD card?

First SD card was made in 1999 but with according to time many changes came in our SD card card. Changes in their shape, size, storage, speed, storage capacity and many more.

Types of SD Card

And many new variety of SD card were made. There are mainly 4 type of SD. And the 4 type of SD card are SDSC, SDHC, SDXC, SDUC. Now let me explain each of them one by one.

SDSC (Secure Digital Security standard Capacity)

SDSC stands for Secure Digital Security Starndard Capacity. This is the second generation of SD card. This card was mainly developed for the improvement of multimedia card (MMC).

many changes where made in this new upgraded SD card such as its thickness was reduced to 1.4mm from 2.1mm.

SDHC (Secure Digital High Capacity)

SDHC stands for Secure Digital High Capacity. This upgrade was announced in 2006. And this is also called SD card 2.0.

And the major upgrade that was made in this SD card was speed its speed was increased to 25 MBPS. Which was one of the biggest upgrade in SD cards.

SDXC (Secure Digital Extended Capacity)

SDXC stands for Secure Digital Extended Capacity. This version of SD card was first announced in 2009. And this was defined in 3.01 of the SD specification and this supports cards up to 2 TB.

The main changes was made in this SD card was its speed now the speed of SD card was increased to 50 MBPS to 104 MBPS. Which was very fast.

SDUC (Secure Digital Ultra Capacity)

SDUC stands for Secure Digital Ultra Capacity. This update was announced in 2018 and it was described in SD 7.0 specification and supports cards up to 128 TB.

And with this upgrade speed was increased to 985 MBPS speed. And SD card was also made a bit smaller than its previous versions.

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What are the different types of SD Class?


Class 2 (C2):- Class 2 (C2) supports only SD video formate and minimum writing speed of 2 Mbps.

Class 4 (C4):- Class 4 (C4) supports only SD, HD and ultra HD video formate and minimum writing speed of 4 Mbps.

Class 6 (C6)1:- Class 6 (C6) supports only SD, HD and ultra HD and 4K video formate and minimum writing speed of 6 Mbps with V6 video speed class.

Class 10 (C10):- Class 10 (C10) supports only SD, HD and ultra HD and 4K video formate and minimum writing speed of 10 Mbps with V10 video speed class and class 1 UHS speed class.

 Class 1 (U1):- Class 1 (U1) supports video formate SD, HD and ultra HD and 4K video formate and minimum writing speed of 30 Mbps with V30 video speed class and class (U1) UHS speed class.

Class 3 (U3):- Class 3 (U3) supports all video formate SD, HD and ultra HD, 4K and 8K video formate and minimum writing speed of 90 Mbps with V90 video speed class and class (U3) UHS speed class.

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What are the benefits of SD Card?

I have told you Full form of SD Card but what about benefits. Now let us talk about some of its benefits. When there are many benefits of SD card. This is one of the best string device. Becuase in this storage type there is no much tension of data loss ad compared to HDD.

And this is very light weight and small which makes it very easy to carry it along with us. And one of the best thing about is that it gives very fast data transfer speed of 985 MBPS and with the help of this we can transfer our data very easily.

And we can us SD card in many devices to store data such as in our smart phone, Laptops, Camers etc. and other then these also there are may other benefits of SD cards.

FAQS related to SD Card

What is difference between SD card and memory card?

Memory card is the smaller version of SD card. Memory card is mainly used in our smartphones because memory card is littlebit smaller as compared to SD card.

What is the SD card used for?

Well there are many used of SD card some of main use of SD cards are They are found in digital cameras, video game consoles, set-top boxes and home theater devices.

Is an SD Card external or internal Storage Device?

Well, as we can store our data and we can move data also therefore we can say that SD card is an external device.

What are best sd card for camera?

Some of the best SD card for camera are SanDisk Extreme PRO UHS-I SDXC, Lexar Professional 633x SDXC UHS-I, Lexar Professional Class 10 UHS-II 2000X Speed, SanDisk Extreme PRO SD UHS-II V90, Sony SF-G Tough SDXC, PNY Elite Performance SDXC 512GB, SanDisk Extreme 90MB/s, Samsung PRO Endurance.

Why are phones getting rid of SD card?

Now most of the latest phones are coming with more then enough storage such as 128GB and 256GB therefore nowadays many peoples have stoped using SD cards in their phone.

What can be stored on an SD card?

Any type of data can be stored in SD card. Some of the main data that are stored in SD cards are Plans, files, photos, and videos.


So now I hope that you have gotten to know about SD card full form. And not only full form but I have given many information about SD cards.

I have tried to provided all the information related to SD cards. But If i have still missed anything then you can ask me in the comments I will surely reply to you.