Given that this is the SSD forum, not Flash mem, but your device is described as microSCHD, I'm gonna choose to believe that, * gigabytes of memory or not, it's a flash card.
In most cases, an unwriteable card is due to either
a) malfunction
b) a tiny little slide switch on the card is set to Write Protect.
It's easier to see case B by looking at the card.