Memory Card plays a very important role in our digital life. There are many words or symbols on the cards no matter SD cards or MicroSD TF cards. What are they? And what does they means? Let us check the memory card words and symbols today.
1. Brand name and product code
Easy to see the brand name holder or manufacturer. Some will put the item# or product ID, too.
2. Memory Card Capacity
It is the first thing many people will check before buying a memory card. And it is also easy to read and know the difference.
3. Speed XX MB/S on Memory Card
We know that XX MB/S indicate the speed. But we should attention that the speed marked here is the max read speed. Yes, Max Speed Read. It cannot keep the same maximum speed as always. It will be high or low with a peak read speed as said on the card.
Actually the write speed is even more important than the read speed for videos. So does the capacity.
4. SD, SD-HC, SD-XC and SD-UC
We could not get so many SD cards in our daily life now. An SD card is with a max storage of 2GB. That isn’t a good choice for our big data times. But we could see the same size SD cards marked with SD-HC and SD-XC.
SD-HC is SD High Capacity. It is a high capacity with max 32GB.
But that is not enough. So there goes SD-XC. It is SD EXTENDED Capacity. It is with a Max 2T capacity and a speed 300M/S.
It is the same if I buy 32GB SD card SD-HC and 32GB SD card HD-HC for videos? What is your idea?
The answer is, NO. They are not the same for camera video record. SD card SD-HC is with FAT32 file system. The video files will be divided into 2 files if it is 4GB or more. SD-XC is with exFAT file system. It is only one video file. That is convenient in videos editing.
SD-UC, it is said that this SD card can reach 128T Max capacity.
5. Memory Card Speed Class
We can see C2 C4 C6 C10 on cards. This shows the speed class write to the card.
C10 means the Minimum Sequential Write Speed is 10M/S.
Blow is the Speed Class with the the Speed Write for your reference.
Speed Class
Speed Write
Remark
Class0
No details
Under C2, or no details
Class2
2M/S
Photos
Class4
4M/S
HDTV, Photos
Class6
6M/S
Cameras, Videos
Class10
10M/S
HD, Full HD videos
6. Memory Card Symbol U1 U3
U1 = speed write ≥ 10M/S, Good for HD Full HD videos.
U3 = speed write ≥ 30M/S, Good for 2K 4K video record.
7. Memory Card Speed V30 V60 V90
V-X is also for speed. This is the video record speed standard. V30 means minimum 30M/S speed write speed.This V-series data is very important for video recorders.
V level speed
Speed Write
Videos
V90
90M/S
8K video record
V60
60M/S
4K video record
V30
30M/S
Full HD 1080+, 4K video
V10
10M/S
HD Videos, 1080P
V6
6M/S
HD videos
8. Memory Card Speed I, II and III
These numbers will show up with V-series number. There are 3 different numbers for memory cards as I,II and III.
I is for UHS-1, Ultra High Speed Class 1.
V60, V90 meets the standard II and III. While V10 V30 is under standard I.
There is also a visual diffrence for these. You can see the contacts for reference.
USH-1 is with a max speed ≤ 104M/S, USH-2 ≤ 312M/S, USH-3 ≤ 624M/S.
There is no I, II or III on the card. What is speed? It is 25M/S Max.
9. Micro SD TF A1 and A2
MicroSD cards mark with A2-class. This means that the Micro SD card meet the particular standard for smart phones that need additional storage space for applications. Both of APP Performance A1(A1) and APP Performance A2(A2) are with minimum Sequential write speed 10M/S. Class A1 is with 1500 IOPS and 500 IOPS. Class A2 reaches 4000 IOPS and 2000 IOPS. A2 is much better for performance of smart phone Application.
Check details as below for Mobile Application Performance Speed
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