Permissions

[Matt Graham]

>> On 01/16/2016 08:03 PM, dad wrote:
>>> Mint 17.3.  8 gig micro card and named the owner dad. [...]
>>> I installed a program called sound converter to convert the 
>>> offensive
>>> files. The micro card will NOT let me add or delete files to it.
> On Sat, Jan 16, 2016 at 10:59 PM, Brian Cluff <brian at snaptek.com> 
> wrote:
>> Did you accidentally flip the little switch on the side of the SD
>> card that puts it in write protect mode?

That was my first thought, but that's apparently not the problem.

On 2016-01-17 17:32, Snyder, Alexander wrote:
> By default, storage devices that are plugged into the system mount
> automatically in the /media/<username> directory.

Some distros do this.  Mint is probably one of them.[0]  Most 
removable-media SD cards have a FAT32 filesystem on them, and FAT 
doesn't actually have Unix-style permissions.  These are faked at mount 
time according to the automounter's configuration, and generally the 
user who's logged in should be able to read and write the files on the 
mounted medium.

So:  Unplug the device, then plug it in again and immediately do "dmesg 
| tail -n 40".  This'll tell you what the kernel thinks is going on with 
the SD card.  It might think the filesystem is damaged and so it's 
mounting it read-only, or something.

[0] I don't think automounters are a good idea for various reasons.

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