SD card format error

[gdonald]

I bought a new 256GB micro sd card. My new Steam Deck will not format it. It gets past the test phase and then fails on the format phase. I'm left wondering what exactly the point of the test phase is?

I am able to format my new sd card with no problems on my Macbook Pro and also on my Windows box. Why won't my Steam Deck format it?

My Steam Deck is up to date and I did already try turning it off and back on, didn't help.

[gdonald]

As suspected there is nothing wrong with my new sd card. Using my Linux laptop I was able to format my new sd card with a new ext4 file system. Now I can use it in my Steam Deck. I'm able to move games over to it then play them from it. Seems the sd card "test and format" feature is just buggy.

[psymin]

This command will wipe out the partition table.

sudo dd if=/dev/zero of=/dev/mmcblk0 bs=8192 count=100

This one might format it for the deck

sudo /usr/lib/hwsupport/format-sdcard.sh --skip-validation

If there are issues, you might need to use f3probe on the device to see if it is legit.

Edit: cripes, I didn't read the reply. Sounds like you got it working. You can test authenticity with f3probe this way if you care to:

sudo f3probe  /dev/mmcblk0