I found an SD card reader that fits


In all seriousness, as I mentioned earlier we can use a different type of SD slot that do not use the surface mount pads (instead the thru-hole ones that go through the PCB in a very narrow hole, which can be right on the edge but soldered)
Also, the thickness of the side of the case can be slightly reduced to provide structural integrity for the PCB.
A custom board with custom shape, thickness and components will be guaranteed to fit.

And lastly, the cover and bottom side can be made of a single piece of aluminum wrapped around the card insert side, which can be made thin yet strong, to provide vertical room to fit the entire module in.

Instead of epoxy or superglue (which will spread around and coat everything in plastic), you can use hotglue and, due to its viscous nature, will not seep into small holes like connectors and furthermore do not generate fumes.

To assemble, I would imagine that you would put the PCB in the plastic mid-frame thing, put a dummy SD card in, put hot hotglue on both sides, then chuck the entire thing into the metal casing and extract the dummy SD card.

To disassemble (for recycle), just pull very very hard (or push) to eject the midframe PCB and stuff. The hotglue do not adhere strongly (but rather due to the large surface) and therefore can be removed in chunks. Then the PCB, the frame, the case and the glue can all be recycled.

Very nice work. Look, it even come with a LED. How cool is that?

This card reader if I am not wrong here actually interface via UHS-II. It’s just that the bandwidth is limited elsewhere (controller speed, USB speed, etc).
Depend on the controller, but the socket break out all the UHS-II pins.

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This is a really great find, thank you!

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This is amazing and terrifying and I hope that something like this can be improved upon by the Framework team. Amazing find and amazing card… Maybe you could even sell that until one becomes available :smirk:

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For those interested in this reader but found its out of stock, this Monoprice reader seems to be identical, down to the clear endcaps.


@RandomUser, given the size of that port, they gonna have to use glue to keep that housing closed; which is a non starter.

Woohoo! So I bought this SD card reader (I’m sure many vendors using different names are selling the same product).
and this file set
and these are my results (so far).

Getting the cover off took a bit of force, but I got it off with my iFixit Jimmy tool.

Then, I started filing down the sides and front corners of the PCB so that it would fit in the expansion card bay.

I’m sure I’ll need to file the adapter more when I put it in a proper enclosure, but for now, this is the filed down PCB side-by-side with the PCB of a USB-A expansion card.

One thing that worries me is that this SD card PCB has no structural reinforcement on the USB-C plug’s solder points, unlike the Framework expansion cards.

Here is the adapter plugged into my laptop. It’s a very snug fit, but it is in there.

And here is how it looks in normal use.

I have already sent in an order for a 3D print of an expansion card enclosure to my school’s library, so as soon as I have that I will file down the PCB even more and glue it to that enclosure (like @maybeRui did).
ExpansionCard.stl (51.3 KB)
Overall, this was a very cool find on @Lee_Holbrook’s part, and I’m super happy with it!


Another update. So my 3D print came in, and I filed the PCB down even more.

Here is the final size of my PCB before it was inserted into the expansion card housing. I may have gone a bit overboard on the front corners.

And here it is in the housing.

After I confirmed that the PCB fit and the USB-C port went through the hole, I took out another expansion card so I had a reference for how far out I should let the USB-C plug stick out. Then, I put super glue on the bottom and sides of the SD PCB and set it in place on the 3D printed housing.

Here is the finished result. It’s a bit more work to get it in and out, but it’s totally doable and I’m very happy with it. It even fits in my unofficial expansion card carrying case (available here), and I now have a USB-C to SD adapter that I can use with my phone too!

One downside when using this adapter in Windows is that after ejecting it, the expansion card must be unplugged and reinserted in order for the computer to recognize an SD card from it again. This is not a problem I noticed in Linux (Pop!_OS for me). Again, thank you to everyone in this thread for your findings, this is awesome!


it depend on the controller. if it is appearing as a mass storage device then yes the computer need to detect that the device have disappeared (from the connected list of devices) before allowing it to reconnect. some card reader I have (some chinese SSK models) have the IC configured so you need to disconnect the cards instead of the actual adapter (which does utterly nothing when plugged into the computer without a card in it)
but that’s easily solvable.

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Is this something you’d still be interested in?

This is no longer happening to me on Windows 11 OS Build 22000.434

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Don’t eject SD’s.

-20 characters-

You should absolutely eject any removable storage, as it might not be configured for “fast removal.” If you confirm that it is configured for fast removal, you can remove it without ejecting it.


No and yes. If it is configured for fast removal, it does not mean that under all circumstances (even during read/write operations) removing the drive will not corrupt the drive. It just means that the drive will be ok if there are no write operations the drive can be removed because the cache (which require power) is not utilized. It will usually be a minor corruption (if any), but it could be worse.

When you eject a drive in Windows, Windows will first check to see if there is any read/write operation (and attempts to stop it, which usually fails), and then it will “demount”/uninstall (different from uninstalling a driver) the device/drive (which basically remove it from “list of attached system resource” so it can no longer be accessed). Then it sends a “stop” command to the device (which may or may not power off), and then it says “you can safely remove the device”.
Mac operates similarly, although I think it demounts instead of tries to stop read/write.

The reason you can’t eject the SD card on its own is because Windows see the entire SDcard+reader as one “mass storage device” instead of a “USB Card Reader” with an “eMMC card” attached underneath it. As a result, it will stop the entire “mass storage device” rather than stopping the eMMC card. And it will refuse to install/connect the SD card reader until it sensed that the device is unplugged and plugged in.

Usually, more “fancy” readers (such as new ones from SSK and Kingston) have them configured as a “card reader” while some old/cheap ones have them configured as “mass storage devices” that merely translates the read/write operations.

I made a copy of this - for me, thanks to the work and writing here, I was able to “just buy the adapter” basically. Bought that item on Amazon, then printed the bracket, chopped the edges off with some tin snips, and jammed it in there. Works a perfect treat. Twitter’s eating it up :joy:

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Small problem: that awesome card reader seems to inhibit “Modern Standby” :joy: (reason number ten-billion why “modern standby” sucks and is just a wallpapering-over of lazy/bad coders that can’t implement proper sleep in their drivers)

Was just digging into why this dang thing is chewing through 3.5W on average while in sleep. A simple sleep study report revealed this, right off the bat.

Gonna try taking out that SD expansion card. Big sad. All just because we can’t have nice things (real standby) anymore on modern laptops, it seems…


What software did you use for this report?

Windows’ built-in utility.

  1. Open an admin command prompt
  2. Navigate to your desktop or whereever (cd %userprofile%\Desktop)
  3. Use powercfg to generate a report (powercfg /sleepstudy) - it uses historic data to generate the report, happens instantly
  4. Open the resulting report (start sleepstudy-report.html)
  5. Review results etc :slight_smile:

For reference, mW is 1/1000th a watt (1000mW = 1W). mWh (1000mW for 30 minutes = 500mWh) is a measure of capacity (like gallons of water, vs. water flow rate as watts). 3 watts is really terri-bad for sleep power consumption! 1W is relatively typical, but still on the high side (my laptops from 2013-ish have a similar figure).


Ah, okay - I thought it was some Linux tool. :slight_smile:

On Linux, we can use powertop for a similar assessment (as well as auto-tuning if you so desire).


don’t the USB bus power down in sleep?
Or is this reason 10,000,000,001 we shouldn’t have modern standby?

Can’t you turn off “additional sleep states” in bios?