Wednesday, January 11, 2023

Accessing an SD Card on Windows from WSL2

Every so often I find that I want to access a Micro SD card from within Linux on my Windows WSL2 setup. I put the card in my laptop and am pleased when Windows announces the new D: drive is available. And then the confusion begins: how do I access this drive from a WSL2 Ubuntu session?

The C: drive is automatically available to me in /mnt/c; not so with D: and /mnt/d.

A Google search inevitably takes me this page which talks about using wsl --mount. While promising, this never works for me.

Often, by now, I've decided I didn't really need to access the SD card *that* badly and give up.

But, it turns out there's a trivial solution! The following mount command is all I need:

  sudo mount -t drvfs 'D:' /mnt/d

Once that command is issued, the SD card files are available under /mnt/d, and are accessible like any other files on Linux. This works for any drive letter, not just 'D'.

Notably, this isn't SD card specific. I just connected an Adafruit ESP32-S2 TFT Feather micro-controller to my laptop and Windows recognized it as a drive.

I issued the same mount command to make this visible to Linux:

$ ls /mnt/d
ls: cannot access '/mnt/d': No such device
$  sudo mount -t drvfs 'D:' /mnt/d
$ ls /mnt/d
'System Volume Information'   boot_out.txt   lib   settings.toml

And success! Now, if I can just remember to check the blog for this solution before I give up...

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