On 30/08/15 07:18, ToddAndMargo wrote:
> On 08/29/2015 09:45 PM, Brandon Vincent wrote:
>> On Sat, Aug 29, 2015 at 8:14 PM, ToddAndMargo <[log in to unmask]> wrote:
>>> I was looking for an easier way to tell if my write protect switches
>>> were in the read only position.  There are other ways, like trying to
>>> mount it and see what happens, but I would like to get the information
>>> more directly.
>>
>> Try querying the block device with udevadm(8).
>>
>> udevadm info -a -n /dev/sdc
>>
>> Brandon Vincent
>>
> 
> Rats!
> 
>   looking at device
> '/devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4.2/2-4.2:1.0/host7/target7:0:0/7:0:0:0/block/sdc':
> 
>     KERNEL=="sdc"
>     SUBSYSTEM=="block"
>     DRIVER==""
>     ATTR{ro}=="1"
>     ATTR{size}=="61767680"
>     ATTR{stat}=="     360        3     2904      376        0        0       
> 0        0        0      376      376"
>     ATTR{range}=="16"
>     ATTR{discard_alignment}=="0"
>     ATTR{events}=="media_change"
>     ATTR{ext_range}=="256"
>     ATTR{events_poll_msecs}=="-1"
>     ATTR{alignment_offset}=="0"
>     ATTR{inflight}=="       0        0"
>     ATTR{removable}=="1"
>     ATTR{capability}=="51"
>     ATTR{events_async}==""

Also double check if "echo /sys/block/sdc/ro" gives you what you want.  I
believe that should be '1' on read only and '0' on read/write.


--
kind regards,

David Sommerseth