Adequate SD card for Uconsole

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.

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

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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.

Thank you for replying and suggestions.

I’ve already been checked the post you mentioned, but I thought there was a difference in speed between worse and better sd card.
As you mention, I realize that I don’t need to buy overspecced one.

Thank you again

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.

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Thank you for your information. I would follow your advice :>

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I always use industrial grade microSD cards on RPi. I usually use SanDisk 16GB industrial micro SD. They cost about 2.5X what a similar capacity card costs, but since it’s only 16GB it’s relatively affordable.

I’m going off topic, but if you can take a step forward and boot from a USB memory with USB boot, will the boot speed be improved?

Would it surprise you if the effective speed of USB 2.0 was 43 MB/s?

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 :grinning:

It’s not going to matter because the port it connects to on the uConsole is USB 2.0. Plug a USB 3.2 device in, and it will fall back to USB 2.0 because it’s missing the new pins.

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The fastest reads you’ll get from the internal SD slot is about 45MBs or so as mike said. So don’t spend to much on a fast card, get reliable.


Oh, exact numbers! Thank you. @Rex :grin:

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.

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you can download the image to a computer from the link and flash it to a sd card using Rpi imager just don’t apply any custom settings. once you have it running you can update and install anything you want.

Oh, then does update through the system console or is there an update setting panel like windows? I would like to try it, but I don’t have CM4 as well as uConsole, lol. :sweat_smile:

Once booted in your uConsole you’ll be able to update in the terminal or the GUI. If you’re new to Linux or Raspberry Pi, I suggest you download pi-apps from their website. It’s a GUI based “app store” with a lot of easy to install apps.

Thanks again. I’ll try it. :smiling_face_with_three_hearts:

Using a 32gb class 10 and a 1tb U3 Sandisk Extreme to try different distros until I get them to crash. The SanDisk was able to put up 42MB/s reads and 34MB/s writes even though it’s only rated for 30MB/s. I was getting 50MB/s+ while writing an image from a windows system looking in task manager.

The ratings on chips tend to be the spec that the manufacturer guarantees the component will perform at. Individual chips tend to have slightly different characteristics due to unavoidable imperfections during fabrication, so chips with similar performance characteristics get grouped or “binned” together for sale. The upshot is sometimes you wind up with a chip that can perform significantly faster than it was rated for.

There’s also sequential writes vs random writes, so it helps to know if you’re comparing apples to apples.