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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    
  • is it encrypted ? – Ruskes Jun 25 '14 at 23:17
  • Fat32 has a 4GB file-size limit. Could you be hitting this restriction? – IconDaemon Jun 25 '14 at 23:57
  • @Buscar웃 Maybe but I would think I could still reformat or something. – Jackie Jun 26 '14 at 1:12
  • @IconDaemon the SD card is only 2GBs. Disk utility won't let me format either. – Jackie Jun 26 '14 at 1:13
  • find the disk identifier with diskutil list (assuming disk1). what's the output of sudo fdisk /dev/disk1 ? – njboot Jun 26 '14 at 1:43
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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: enter image description here ...And R/W when connected via my USB. enter image description here

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

enter image description here

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Try remounting the filesystem in read-write mode, using:

mount -o update /dev/disk2

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