[nmglug] weird memory card behavior

[nick pitlosh]

sudo dd if=/dev/zero of=/dev/sdX

X is the block device. I would recommend NOT adding a partition number.



On Thu, Feb 9, 2012 at 10:56 PM, Nick Frost <nickf at frostitute.com> wrote:
> On Feb 9, 2012, at 10:48 PM, Rob Haag wrote:
>
>> Check this out http://activerain.com/blogsview/1239207/memory-card-is-locked-error-message, this is what has given me the same situation...if the camera won't write to it then this is the thing to check first. The switch sometimes gets activated taking the card in/out of a device.
>>
>> On Fri, Feb 10, 2012 at 12:42 AM, BrianO'Keefe <okeefe at cybermesa.com> wrote:
>> It is fat32 according to disk utility and I can't alter it in anyway without getting a "read-only" error. I tried with GParted and disk utility. In disk utility I get the read-only or "the daemon is inhibited". I cannot format it in the camera without getting the read-only message.
>
> As Nick P. suggested…..if the write-protect tab on the SD card is not the culprit the card will likely have to be formatted in the camera once the pictures have been downloaded.   The problem with accessing SD cards directly (via a reader as opposed to the camera being attached to the computer via USB) is that if a write occurs the file system can be altered or damaged causing problems. Cameras usually use FAT16 or 32 but they are not what I would call "normal" FAT16/32 file systems if one looks at them with a disk editor. I've seen this (SD card file system problems after direct access) many times. Usually I recover the photos with PhotoRec (CGSecurity) on the nearest Linux box and re-format the SD card in the camera…..and if that doesn't work it's usually the SD that's gone bad and replacement has solved the issue.
>
> -Nick
> ---------------------------------------
> Nicholas S. Frost
> 7 Avenida Vista Grande #325
> Santa Fe, NM  87508
> nickf at frostitute.com
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