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
Best Answer
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: