Canon Community Canon Community
 


Reply
Esteemed Contributor
Posts: 3,394
Registered: ‎06-11-2013

Re: why is the red light (lower R corner) continually blinking when I turn camera on?

Every new card should be formatted .... and more specifically, you should format the card using the camera.  (Do not format the card in your computer.)  

 

When you go into the format menu, you will see a checkbox to perform a "low level" format.  On most cameras that option is checked or unchecked by pressing the camera button with the trash-can icon on it.  Check the "low level" option for the first format.  

 

If a card has bad blocks on it, the "low level" option will detect them and map them out of the filesystem (so that the camera will never attempt to use the bad block).  If you do not enable the "low level" option then it will not necessarily notice these problem areas and could end up attempting to write an image to it (likely resulting in a corrupt image -- which we don't want.)

 

You generally only need to apply the "low level" format once ... but if it's been a long while since the card was formatted, it wouldn't hurt to do it again just in case any problems with the card have developed over time.

 

The process of "writing" to a card is technically physically destructive and causes wear on the card.  Reading, however, is not destructive... you can "read" from a card an infinite number of times without causing any wear.  Original flash memory technology wasn't nearly as good as current technology.  Those old cards didn't have anything to perform "wear leveling" so the blocks at the beginning of the drive tended to be used over and over and over... the blocks at the end of the drive never got used.  Also, they couldn't take as many "write" and erase cycles before the blocks would become unreliable.  Modern cards seem to do much better and can probably be written and re-written over 100k times (it's unlikely you'll ever actually wear one out.  Your camera's mechanical shutter mechanism will probably wear out before your memory card does.

 

Tim Campbell
5D III, 5D IV, 60Da
New Contributor
Posts: 2
Registered: ‎04-09-2018

Re: why is the red light (lower R corner) continually blinking when I turn camera on?

I have the same problem after continuous shooting, it stays there for a longer time than it did before, even that I have been using the same card that I used before. 

Occasional Contributor
Posts: 6
Registered: ‎08-18-2015

Re: why is the red light (lower R corner) continually blinking when I turn camera on?

Thank you for the complete explanation re: formatting the card in the camera. I am not sure, however, whether doing that will delete all the pictures currently on the card!?  Can you help!?

 

Reputable Contributor
Posts: 709
Registered: ‎06-11-2013

Re: why is the red light (lower R corner) continually blinking when I turn camera on?

[ Edited ]

@LDTeacherwrote:

Thank you for the complete explanation re: formatting the card in the camera. I am not sure, however, whether doing that will delete all the pictures currently on the card!?  Can you help!?

 


The quick form of formatting in-camera will "mark" all the existing images on the card as "okay to overwrite", so be sure you've copied off any you want to keep. It doesn't exactly erase them (which is why you may be able to recover them if you accidentally format a card with images you want, so long as you don't start overwrititng them with new images).

 

The "deeper" or "low level" form of formating, I think will erase everything on the card.  I'm not sure because I very rarely do that... only if a card has been giving problems. On the other hand, I do in-camera "quick" format of every card, every time, first thing after I insert in the camera. That insures the card is ready for use in that particular camera. (I use several different cameras, which may or may not all use the same file system, etc.)

 


@richard2996wrote:

I have the same problem after continuous shooting, it stays there for a longer time than it did before, even that I have been using the same card that I used before. 


 Please read the earlier responses. Chances are you either have a slow card or that you haven't been regularly formatting it. Depending upon the camera and the write speed of the memory card, if you fire off a burst of shots the camera may have to pause to clear it's "buffer" (memory). While it's doing that, the red LED should flash. That's to warn you not to turn the camera off or open the memory card door and remove the card, until it's completed saving all the files that have piled up in the buffer.

 

If you shoot JPEGs only, the files are smaller, the camera should be able to take more in a high speed, continuous burst and if it needs to pause, the buffer should clear faster. If you shoot RAW, the image files are bigger so it will be able to take fewer images before needing to pause and when it does, it will take longer to clear the memory. If you shoot RAW + JPEG, that's a lot more data to process so will be able to take even fewer shots in a burst and take even longer to clear the buffer.

 

Just how fast all that happens depends upon the quality and write speed of the memory card you're using. Some is pretty slow, which will slow down the camera's peformance. But if you use memory that's at least as fast as the camera can write, that will give you the quickest image saves and shortest possible pauses to clear the buffer. Even faster memory won't help, since all cameras have their limitations, too. 

 

But, again, format the memory card in the camera. It only takes a few seconds and may help.

 

***********


Alan Myers
San Jose, Calif., USA
"Walk softly and carry a big lens."
GEAR: 5DII, 7DII (x2), 7D(x2) some other cameras, various lenses & accessories
FLICKR & EXPOSUREMANAGER 

 

 

powered by Lithium

LIKE US on Facebook FOLLOW US on Twitter WATCH US on YouTube CONNECT WITH US on Linkedin WATCH US on Vimeo FOLLOW US on Instagram SHOP CANON at the Canon Online Store
© Canon U.S.A., Inc.   |    Terms of Use   |    Privacy Statement