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Photo Forum / Digital Photography / DSLR Cameras / March 2006Need clarity on deleting CF card data
Here is a question I sent to Canon and their response. When I read the camera's flashcard using Windows Explorer, I see the following files: DCIM and several files as follows: 100Canon, 200Canon, 300Canon, etc. I know these contain my images until I move them or erase them. Can I delete these and still have the images recorded in numerical sequence? We recommend formatting the card in the camera after all images have been downloaded. Formatting will completely erase the card and set up a new file structuring system which will aid in not having corrupt files. We do not recommend deleting folders via Windows Explorer. We hope this information is helpful to you. Please feel free to contact us again if you have any other questions or concerns. Wouldn't this start my numerical sequence from 0? I would like to keep the sequence going from the last image I took (i.e.: IMG_1597). Dave >Here is a question I sent to Canon and their response. > [quoted text clipped - 3 lines] >them. Can I delete these and still have the images recorded in numerical >sequence? >Wouldn't this start my numerical sequence from 0? I would like to keep the >sequence going from the last image I took (i.e.: IMG_1597). Time to RTFM. My Nikons have a function that allows you to keep the numerical sequence going or start over every time you format or erase the files from the card. Actually you have to be careful putting in a card from another camera as they can pick the sequence up from the highest numbered file on th card. Your Canon should have similar functions. -- Ed Ruf Lifetime AMA# 344007 (Usenet2@EdwardG.Ruf.com) http://EdwardGRuf.com >>Here is a question I sent to Canon and their response. >> [quoted text clipped - 10 lines] > numerical sequence going or start over every time you format or erase the > files from the card. So does the Canon .... as the OP will find out when he finds time to RTFM as you quite correctly suggested ;o) > Here is a question I sent to Canon and their response. > [quoted text clipped - 13 lines] > Wouldn't this start my numerical sequence from 0? I would like to keep the > sequence going from the last image I took (i.e.: IMG_1597). Deleting the folders elsewhere doesn't effect the numbering. How do you think people use new compact flash cards? Having said that I would avoid using Windows Explorer to manage your cards. XP and Win2k are the only OSes that have corrupted cards on me the few times I've used my girlfriend's laptop or brought a card reader in to work. Conversely I've never had a problem with OS X or OpenBSD. I like Canon's advice but it's so much more convenient to just delete when I have the card reader attached to my computer. Greg >> Here is a question I sent to Canon and their response. >> [quoted text clipped - 25 lines] >advice but it's so much more convenient to just delete when I have the card >reader attached to my computer. Formattting a Camera's CF card in a PC is very NOT desirable, and unnecessary. Whenever I pop a CF card in my camera I format it. Unless I forget :-) needless to say, I never "store" pics on my CF cards.  Signaturea d y k e s @ p a n i x . c o m Don't blame me. I voted for Gore. >> Here is a question I sent to Canon and their response. >> [quoted text clipped - 29 lines] > card > reader attached to my computer. "Delete" and "Format" are two quite different things. This, I suppose, is why Canon recommends that the camera be used to *format* the card instead of simply deleting the files in Windows. I'm not sure with cameras and cards, but I know that in non-linear video editing there are many more things written to disk than the actual media files. If the obvious files are simply deleted that stuff just piles up and takes up space, and can lead to corruption when things get too bad. Also (at least with disks) formatting recognizes and skips bad sectors, whereas a simple delete and rewrite can allow data to be written to newly-bad areas where it can no longer be read. Toby >Here is a question I sent to Canon and their response. > [quoted text clipped - 15 lines] > >Dave I would presume that the numbering of pictures is contained in memory within the camera. Otherwise just changing flashcards would confuse the system. > Here is a question I sent to Canon and their response. > [quoted text clipped - 13 lines] > Wouldn't this start my numerical sequence from 0? I would like to keep the > sequence going from the last image I took (i.e.: IMG_1597). Reformating is the way to go, and it does not mess up the numbering. Canon did fix it so that more then 100 photos go in a folder for the 30D, something that is pretty odd on the older cameras. I re-format the card on the 20D each time I off load the photos. As others have said it is best not to mess with the card using the computer other then to read the files off of it, I would not delete any files or folders using the computer. Scott > As others have said it is best not to mess with the card using the > computer other then to read the files off of it, I would not delete any > files or folders using the computer. Scott, I agree. It does seem odd, that windows should do best on FAT file systems and not have any problems. Go figure. I only format or delete files in the camera, never with the card attached to a computer. Microsoft just won a patent suit on the FAT file system so now were may to have to pay royalties for its use in CF cards, memory sticks, etc! Seems like we should move to a journaled file system as it would be more robust against failures and power loss (like when someone pulls a card out of the camera). Roger > Here is a question I sent to Canon and their response. > [quoted text clipped - 15 lines] > > Dave Whether or not the camera starts from zero or is continuous depends on a setting in the menu. If you poke around in the menu, you'll find it. Reformatting the card will not set it back to zero. I always reformat the card after copying the files over to my hard drive. Concerning what others have said about formatting the card via Windows, as long as you format the card in-camera afterward, it really doesn't matter what you did to it before then, as long as what you did before didn't involve submerging the card in caustic liquids, etc. > We recommend formatting the card in the camera after all images have been > downloaded. Formatting will completely erase the card and set up a new file > structuring system which will aid in not having corrupt files. We do not > recommend deleting folders via Windows Explorer. > We hope this information is helpful to you. Please feel free to contact us > again if you have any other questions or concerns. I'd agree with that. > Wouldn't this start my numerical sequence from 0? I would like to keep the > sequence going from the last image I took (i.e.: IMG_1597). I format all the time and the sequence keeps on goin'. > Here is a question I sent to Canon and their response. > [quoted text clipped - 13 lines] > Wouldn't this start my numerical sequence from 0? I would like to keep the > sequence going from the last image I took (i.e.: IMG_1597). The sequence numbers are set in the camera. You can format the card after uploading to the computer. In article fishfry says... > The sequence numbers are set in the camera. You can format the card > after uploading to the computer. For completeness, the sequence numbers can be altered by using a card with a higher numbered shot than the internally remembered (after restarting at zero if necessary). > Here is a question I sent to Canon and their response. > [quoted text clipped - 15 lines] > > Dave No, the numbering continues. Also, their statement is wrong as well - formatting does *not* completely erase the card at all, it only rewrites the File Allocation table and sets up the DCIM folders. Providing you haven't used the card subsequent to an in-camera format, all the 'erased' pictures are recoverable with appropriate software, e.g. PC Inspector, a free file recovery program. Colin D. >> Here is a question I sent to Canon and their response. >> [quoted text clipped - 27 lines] > > Colin D. Colin is right I am doing this now for my mum who formatted her card before saving her pictures to hard drive.. whoops!! still thanks to PC Inspector smart recovery (convar) I am recovering them!! Loopy >Here is a question I sent to Canon and their response. >When I read the camera's flashcard using Windows Explorer, I see the >following files: DCIM and several files as follows: 100Canon, 200Canon, >300Canon, etc. I know these contain my images until I move them or erase >them. Can I delete these and still have the images recorded in numerical >sequence? >We recommend formatting the card in the camera after all images have been >downloaded. Formatting will completely erase the card and set up a new file >structuring system which will aid in not having corrupt files. We do not >recommend deleting folders via Windows Explorer. >We hope this information is helpful to you. Please feel free to contact us >again if you have any other questions or concerns. >Wouldn't this start my numerical sequence from 0? I would like to keep the >sequence going from the last image I took (i.e.: IMG_1597). It does NOT restart the sequence at 1 on a Canon 300D. ---- Paul J. Gans |
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