[PLUG] Device is read-only

[John Jason Jordan]

On Sat, 26 Feb 2011 11:07:01 -0600
Patrick Robins <13.finn at gmail.com> dijo:

>On 02/26/2011 11:01 AM, John Jason Jordan wrote:
>> I should know how to do this, but I don't. Or maybe it can't be
>> fixed.
>>
>> The computer is a Thinkpad T61 with Fedora 14, x86_64. The device is
>> a Transcend 32 GB SDHC card. According to dmesg it mounts
>> automatically when inserted at /media/FC30-3DA9/. The filesystem is
>> vfat, which is how it was formatted when I bought it. Any attempt to
>> copy files to it results in "the device is read-only."
>>
>> The card has a slider on the side to lock the card, reminiscent of
>> the slider switch on ancient floppies. But it doesn't matter which
>> position I place the switch in, I cannot copy files to it, either
>> with Nautilus or from the command line as jjj or as root. According
>> to Nautilus I am the owner of the device.
>>
>> As root I can umount it and then mount it again. But if I mount it
>> with the -w switch it gives me an error message that the device is
>> read-only:
>>
>> [root at Devil8 media]# mkdir SDC
>> [root at Devil8 media]# mount -w /dev/mmcblk1 /media/SDC/
>> mount: block device /dev/mmcblk1 is write-protected but explicit `-w'
>> 	flag given
>>
>> And curiously, even thought I told it to mount the device
>> at /media/SDC/ it is mounted at /media/FC30-3DA9. From a plain mount
>> command after mounting it as above I get:
>>
>> /dev/mmcblk1p1 on /media/FC30-3DA9 type vfat
>> (ro,nosuid,nodev,uhelper=udisks,uid=500,gid=500,shortname=mixed,
>> 	dmask=0077,utf8=1,showexec,flush)
>>
>> Maybe the device is defective, like the slider switch is not
>> unlocking it? Maybe I don't know what I'm doing?

>I ran into this problem recently it turned out to be the permissions on
>the dir it was mounted to that were the issue for me.

I think it is just defective. 

[root at Devil8 media]# umount /dev/mmcblk1p1
[root at Devil8 media]# mount /dev/mmcblk1p1 /media/SDC/
mount: block device /dev/mmcblk1p1 is write-protected, mounting
	read-only

At least now I can get it mounted in the SDC folder that I created for
it. But mount insists that it is write protected, regardless of which
position I put the slider switch in.