My micro SD card doesn't allow me to add anything to it

SanDisk MP3 players All other MP3 players
1

Every time I try to add something it says

the disk is write protected

remove the write protection or use another disk

I don’t know what’s  wrong with it it is not locked or anything like that those any one know how to remove the write protected thing?

2

What size is the card? Could be the SDHC format (4GB and up) isn’t recognized. These players pre-dated this larger format and can only read SD (2GB and under).