While you wait for answers, we may have found some information which could help you.
Click here for Pen Data UsbMemory stick - camera says it is full but it is not?
How can I download onto my Sony 1GB Memory stick when it says it is full?
broken memory stick?
how can i fix a pen drive?
how can i use my flash drive Sony Vaio 4 GB?
why my pendrive is not opening?