Can't write to Fat32 MicroSD disk I have a disk, it is MicroSD and I have a macbook. I enter said disk into said Macbook and when I try to copy I get...

/Volumes/SDCARD/file.img: Read-only file system


I tried the ole......

sudo chmod - R 777 /Volumes/SDCARD


But not luck any ideas? 

I also made sure the read-only switch on the adapter wasn't set

FDisk

Disk: /dev/disk2    geometry: 964/64/63 [3887104 sectors]
Signature: 0xAA55
         Starting       Ending
 #: id  cyl  hd sec -  cyl  hd sec [     start -       size]
------------------------------------------------------------------------
*1: 0B 1023 254  63 - 1023 254  63 [      2048 -    3885056] Win95 FAT-32
 2: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
 3: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
 4: 00    0   0   0 -    0   0   0 [         0 -          0] unused
The SD Card is failing. Oddly enough, you can mount it as RW using a SDXC > USB adapter (don't ask my why, but it works) such as this. Once mounted, you can copy data off the card. It's not a question of a corrupted filesystem, but a physical failure of the device - for example, although you will be able to reformat the card when connected via this adapter, it will nevertheless revert back to read only if connected directly again; it will eventually fail completely. If citations are desired, I don't have any off-hand. My source is personal experience, multiple times over. Best of luck. 

Update (Found an old card):

Here is one of my old, dead 8GB SD cards that is read only when connected via my SDXC port:

...And R/W when connected via my USB. 


...And finally, immediately after I took these screenshots: