4 Advice to Choose a Custom Memory Card Connector

Between SD, SDXC and SDUC cards, UHS-II and UHS-I standards, V30, V60 and V90 acronyms, it’s not always easy to understand the characteristics of SD memory cards.

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In this article, we review the main features of the different SD cards.

We explain the different standards, acronyms and logos that exist, so that you can choose the memory card that best suits your photographic work.

1. The SD card, the photographer’s essential tool

The SD card is by far the best-known and most widely used memory card format.

Launched in , this card format has established itself in many fields: photography, video, mobile consoles, action-cams, drones and smartphones.

SD memory cards are generally chosen for use in more or less high-end cameras, and have a dedicated slot in a good number of computers.

The characteristics of SD memory cards have evolved in recent years to the point of making the technical data sheet complex to understand and decipher. The certifications that were supposed to simplify understanding for consumers have actually had the opposite effect.

Let’s summarize the different characteristics of SD cards so that you can choose the one you need without any headaches.

3. Reading speed

Another sign you’ll see on the SD card is I, II or III in Roman numerals.This sign indicates the reading speed of your SD card.

The SD card uses a communication interface called a “bus” to enable devices to read and write data to the card. This bus is responsible for the speed at which data is transferred between the card and the camera.

By definition, all V90 SD cards are therefore also U3 and C10. Similarly, V10 cards are necessarily U1 and C10. On the other hand, a C2 or C4 card cannot have any high-speed or video class, as its maximum write speed will be 4 or 6 MB/s.

Write speed is one of the parameters not to be overlooked when choosing your memory card.

Even if speed is not your priority, it’s always better to choose a fast memory card when opting for a large storage capacity. Otherwise, data transfer can take a long time.

• SDXC memory card
• SDXC card with 64GB storage capacity
• UHS-II card with 300 MB/s read speed
• A V90-class card with a write speed of up to 90MB/s

Beware of the card speed trap. The card indicates 300 MB/s, whereas it doesn’t exceed 90 MB/s in write mode.

In read mode, SD cards, like SSDs and hard disks, can reach much higher speeds. This read speed depends mainly on the bus used, whether standard, high speed, UHS-I, UHS-II, UHS-III or EX.

However, for photographers or videographers, when choosing an SD card, it is above all the write speed that is important.

Hello guys, I’m a waiting guy for receiving awesome black stuff like you guys.
I have a question regarding SD card selection.

I would like to know about the maximum read/write speed of Uconsole’s SD card slot.
I don’t want to buy an overspecified SD card and I’ll save some money for other stuff.

I’ve been looking for an SD card which has over 130 mb/s write speed, and is it too overspec? If I can get some information about the maximum r/w speed, I think I can just pick one under the maximum.
Me personally prefer for Samsung sd card and I’m having a mind to get 256 gb EVO or PRO sd cards.

For more information, please visit Custom Memory Card Connector.

Thank you for reading and I’d be grateful if you give me some information or any suggestions.

Instead of asking in a new topic, try looking into posts similar to yours first.

Based on my judgment, just go with any card similar to the one they provide when you order any kit with a core. An over-specced card will most likely go to waste since the card reader may not have the capacity to read as fast as is capable by the card.

You may consider purchasing the cards with longer service life (industrial types). New models come with up to 256GB storage.

I’m currently using a 256GB Amazon Basics card for my install of PostmarketOS. If you’re using the CM4, the read and write bottlenecks are going to be well below the capabilities of any modern card you can buy. On the CM4 it’s something like 43MB/s read and 36MB/s write. I don’t know if this is the same on the A-06, so I’d appreciate if someone ran a bechmark for science.

You could spend a lot of money on an industrial SD card that is less likely to fail. Or you could periodically back up your configs and dot files and anything important. When I’ve had SD cards fail, I was lucky enough to still be able to access everything in Read Only mode, which at least allowed me to salvage my stuff.

My advice is go with any reasonably priced SD card from a brand you recognize. Don’t get one that’s $3. Don’t get one that’s $300. Aim around $30.

I just assembled my uConsole yesterday, and I’m not sure about the reading and writing speed of uconsole yet.

I bought a Samsung high speed memory card for my device and the pictures are the results of testing it on a usb 3.0 card reader.

The price I bought was RMB ¥212.90, which is about 30 US dollars.
I hope this information is helpful to you.

Thank you for sharing your result.

Maybe you know and I’ve heard that the sd card needs a reader that allows it to reach its maximum read and write on PC.

Reader like this

It seems like that the test you did was on the desktop, right?
Could you try to test your card’s on Uconsole if possible?
Thanks a lot and I’m looking forward to a good result

Oh, exact numbers! Thank you. @Rex

Could you answer one more question? I haven’t received my uconsole yet, but when it arrives, I’ll try to use your bookworm OS image on it. I ordered it without the core, and I knew that there isn’t an sd card with OS images from clockworkPi.

So I’ll buy CM4 and sd card, and my question is here: Is it possible to download bookworm image using just sd card and reader (with Raspberry Pi Imager) or should I do it via uConsole sd card slot and usb port after assembling uconsole? And when the OS update is, do I have to do the whole process again or is there a good way to update? I’m sorry but I don’t know well about Linux or raspberry pi and I’m trying to learn through uConsole.

I appreciate again to your wonderful work and I cannot wait to dive into uconsole and Linux world with your OS image.

If you are looking for more details, kindly visit What Is an Idc Connector.