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Micro SD card detected but unusable, mounted on /dev/sdb

in flag

Been having a difficult time trying to get a 256 GB micro SD card to be usable on my machine, as it is only detected as Generic- USB3.0 CRW -SD(1.00) through gnome-disks, and using ls /dev/sd* gives me this output:

/dev/sda /dev/sda1 /dev/sda2 /dev/sdb <-- with micro SD card inserted

/dev/sda /dev/sda1 /dev/sda2 <-- without micro SD card inserted

Doing sudo fdisk /dev/sdb gives fdisk: cannot open /dev/sdb: No medium found

Using parted sudo parted /dev/sdb again spews out an error of the same nature: Error: Error opening /dev/sdb: No medium found and retrying landed me with the same result.

I'm pretty stumped here, and I'm not sure what to do next, nor do I know if the micro SD card is even usable. For context, I used this SD card in a Raspberry Pi for a while and left it to sit for about a month. The SD card did sometimes have issues showing up but manually mounting it would work fine. Of course, that isn't an option this time around. Anything I can do about this?

in flag
Does the SD card hardware on the computer support 256GB SDXC Class 1 cards? If it's an older computer, then it may have an SDHC card reader, which has a limit of 32GB.
in flag
Yes, the computer does support it as up until this point it was perfectly fine. I think it has more to do with the SD card itself
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