I have a 4GB MicroSD card that apparently only works (in the sense that the device detects and can read and write from and to the card) with my old Nokia XpressMusic 5800 phone.

I have taken pictures and recorded voice notes that were saved on the card. These are accessible after the card has been removed, which tells me that the problem isn't with the card.

The card could also not be locked to the phone as it would at least be detected by a computer and it would be able to write raw data to it with dd, such as /dev/zero. Also, the card is not the Nokia card that came with the phone and I have done nothing that would have caused it to be locked. (I could not find anything on Nokia's website that helps, but then again... my search was not THAT thorough.)

The card works on no other device that I have tried so far. I have tried it in my Canon camera (through an adapter), but it refuses to even boot with the card inserted.

My card reader (via USB cable and hub) is detected as /dev/sdx with or without the card inserted. When trying to access the card I get an "No medium found". dmesg does not report any change at all when inserting and removing the card.

I would obviously like to use my card on other devices - the phone is quite old - and even a likely explanation would help.

Thankyou in advance!

EDIT 1: I can use the card by connecting the phone to my computer, but this is impractical and would not allow me to use the card in any other device.

EDIT 2: The data on the card is not important to me at all.