New SD card won't auto-mount, will only mount as read-only

[3x5co]

I just got a 256gb, off-brand MicroSD card (it's actually Onn brand, which is a Walmart generic brand). Anyway, I formatted it on my computer, and everything seemed fine. But when I put it into my Pinephone, it won't mount. I can only mount it like so:

Code:

sudo mount -t ext4 -o ro /dev/mmcblk0p1 /storage/0000-0000/;

And if i put 'rw', it won't mount. It says 'bad superblock'. This is no matter how many times I reformat, if I recreate the partition table, If I disable journalling. I have even formatted it from inside the pinephone and it won't mount. Does anyone know what I can do to make my card auto-mount, and make it writable?

[Zebulon Walton]

Sounds like the SD card is defective.

[3x5co]

Yeah. I'm just going to mark this as solved because that is the most likely answer. I'll just return it and get a higher-quality card.

[dachalife]

Yeah. I'm just going to mark this as solved because that is the most likely answer. I'll just return it and get a higher-quality card.

I have the same problems with USB pen-drives or sd cards from the grocery store and I don’t know what it is; they never work.