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.
Best Answer
I hope this is your phone, from that page I came to know that your phone has the Symbian OS. I hope there's an option in those phones to password-protect a memory card.
Nokia E5-00 - Memory card security(Though it is for a different model, I hope it also applies for your phone too.)
If I recall correctly, if you password protect a Memory Card in those phones, pc does not recognise them. But, if you put the Card in another phone which support Memory card password protection, then you can access the memory card, but only after entering the password.
If you remember the password, you may put it in another phone which support the option, enter the password, then remove password protection from your card. Thereafter you can access it from your pc. On the other hand, if you do not remember the passwor, put the memory card to the phone where it works, remove the password (I remember that the option is in the gallery->click option on memorycard.).
If you can't do both of them (how sad, isn't it), put it in another phone that supports password protection and format the memorycard.