Re: [OM] Strange occurrence with SD card

[Chuck Norcutt]

It may be helpful to know the that the computer has 2 forms of 
formatting.  There is "Quick format" which only clears all the directory 
entries.  All the file data is still there but with no descriptive info 
available.  That is much different than a "Full format" which will write 
and read back test data to every sector in the disk.  In the process it 
will destroy all of the folder entries and all file data and make the 
disk appear as new... totally empty and also checked over to see that 
there is write/read integrity.  Full format takes considerable time.
The camera, on the other hand, only knows how to do a Quick format.  But 
even there it differs from the computer's Quick format in that the 
camera doesn't leave a totally empty directory... it adds a few folders 
with unique names that it knows about which later lets the camera 
recognize the card as one of its own.
There is no justification for erasing in the computer and then 
formatting in the camera.  Erasing everything in the computer is the 
equivalent of a Quick format but more tedious.  But if you do format in 
the computer (either Full or Quick) the camera will reformat the card as 
soon as you install it since the computer will not have added the unique 
folders the camera requires.
I recommend following Jez's procedure.  I never delete individual files 
from the card either in camera or in computer.  Too much work going on 
following chains of pointers that increase the odds of an error.  I 
temporarily retire cards that have had everything uploaded.  They sit in 
a queue until at least one other backup is made.  At the point they get 
formatted in-camera.
Chuck Norcutt


On 10/2/2016 7:00 AM, Jez Cunningham wrote:
> What's the point in deleting if you're going to reformat?  I only ever
> reformat - in camera.
> Jez
>
> On Sunday, 2 October 2016, Nathan Wajsman <photo@xxxxxxxxxxxxxx> wrote:
>
> > On the contrary: the card should be erased in the computer, then formatted
> > in the camera. I do it every time I download pictures and have never had a
> > problem with a card (SD and CF) in the 12 years I have been shooting
> > digital.
> >
> > Cheers,
> > Nathan
> >
> > Nathan Wajsman
> > Alicante, Spain
> > http://www.frozenlight.eu <http://www.frozenlight.eu/>
> > http:// <http://www.greatpix.eu/>www.greatpix.eu
> > PICTURE OF THE WEEK: http://www.fotocycle.dk/paws <
> > http://www.fotocycle.dk/paws>Blog: http://nathansmusings.wordpress.com/ <
> > http://nathansmusings.wordpress.com/>
> > Cycling: http://www.crazyguyonabike.com/belgiangator <
> > http://www.crazyguyonabike.com/belgiangator>
> > YNWA
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > > On 02 Oct 2016, at 11:09, ChrisB <ftog@xxxxxxxxxxxxxx <javascript:;>>
> > wrote:
> > > Wayne
> > >
> > > I’ve always understood that computer functions such as Erase should not
> > be carried out on SD cards in the computer; apparently it can cause
> > problems.
> > > I always delete images from the card using the camera; I rarely
> > re-format because I want to retain the name of the card.
> > > Chris
> > >
> > > > On 2 Oct 16, at 03:49, Wayne Harridge <
> > wayne.harridge@xxxxxxxxxxxxxxxxxxx <javascript:;>> wrote:
> > > > I took a few shots with my OM-D E-M5 this afternoon and then uploaded
> > them
> > > > to my Win 7 PC using the standard Windows program.  As the images were
> > > > loading I noticed a large number of images from June appearing, looks
> > like a
> > > > contiguous block of about 80 images followed directly by the recent
> > images.
> > > > I normally upload with the "delete" after upload option.  Has anyone
> > else
> > > > seen this behavior ? Any ideas why this might have occurred ?  I assumed
> > > > that there was some sort of corruption in the SD card file structure so
> > > > formatted the card (in camera) and now the behavior is back to normal.
> > > --
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