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how to delete pictures all at once from a memory card?

Tara Ratliff , May 05, 2013; 09:32 a.m.

How do you delete pictures all at once on the Canon Mark III?


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Glenn Cummings , May 05, 2013; 10:00 a.m.

If your referring to deleting all of the images on the card, quite simple really. Format the card in the camera, this will erase all data on the card.

William Kahn , May 05, 2013; 10:21 a.m.

What Glenn said. I routinely do this after every shoot - after I make sure all the images are safely in the computer...

Don Pugh , May 05, 2013; 10:39 a.m.

Or scroll through the menu to the 1st menu under the 3rd symbol at the top, the forward arrow to the right of "AF". The 3rd item down is "Erase images"; hit the set button and it will give 3 choices, including "erase all images". Go to that, hit the set button and the display will show them being quickly erased. Then when you press the arrow button on the left hand side of the back of the camera that is to display an image on the LCD, you will get "No image".

I also erase all images on the card(s) after I am sure they have been downloaded to the computer.

Travis McGee , May 05, 2013; 06:40 p.m.

Old school, but I always reformat the card three times.

Marcus Ian , May 06, 2013; 09:42 a.m.

That is old school. I don't suppose there is any harm in it though.

Yes, formatting the card is about eighteen times faster than any other 'delete all' commands. It takes (my) camera ~ 1-1.5 seconds even for full 32gb cards. The last time I used the 'delete all' command, it took it about 15min (though on a slower camera).

Should note that formatting does not erase the card, in laymens terms it simply 'reallocates' the space, and lets the card tell the camera that all that space is now free to be used again, simply 'forgetting' where it put all your originals - no dif in performance between that and a truly 'clean' card of course, and I don't recall if 'erase all images' does the same, but I like being able to recover the images that are not overwritten (by new pictures) with appropriate software, should my computer (and backup drive) unexpectedly explode.

Mendel Leisk , May 06, 2013; 03:45 p.m.

What I do:
Put card in card reader connected to PC. Copy images over. Verify copy ok. Format the card.
I've seen many cautions not do do this, but it's worked for me.

Mendel Leisk , May 06, 2013; 03:46 p.m.

What I do:
Put card in card reader connected to PC. Copy images over. Verify copy ok. Format the card.
I've seen many cautions not do do this, but it's worked for me.

Jon Austin , May 07, 2013; 12:57 a.m.

I prefer to format the card in the camera, rather than when connected to the PC.

Also, I don't format the card (or erase any images from it) until I have copied all the images to both my PC and my back-up drive.

Technically, a format rewrites the file allocation table, while deleting any/all images simply marks each file as deleted within the table.

sherman peabody , May 07, 2013; 01:23 p.m.

On my two Canon cameras, the A590is P&S and the T2i, there's an option to "low level" format the card. I believe that does completely erase the card, not just delete all the files. I tried running Recuva after a low level format, and it couldn't find anything on the card.

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