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Can't delete files from my sdhc cards after use in Canon SX20is

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I haven't been able to find a solution to this other than to format every time the cards are full. The Canon CameraWindow software can delete the jpgs, but can't see the dngs, so that although I can download these with a file manager, on trying to delete, a message tells me the card is write protected, which physically it is not. With a normal SD card I can delete via a card reader, but these cards are rather slow when saving film and raw data. I notice that one of my cards that is not set up for CHDK also has this problem (even though there are no dngs). I tried the fix on the Sandisk site, but it doesn't work. Is this a common problem, or have I perhaps got a duff card reader? Look forward to any tip.
thanks otherwise for the great work of the CHDK developers!

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Offline fudgey

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Re: Can't delete files from my sdhc cards after use in Canon SX20is
« Reply #1 on: 06 / March / 2011, 08:29:01 »
Sounds odd...Linux often mounts corrupted file systems read-only, something like this could be going on with your card reader too.

But you should be able to delete your dng files in camera (without having to format the card) using the CHDK file browser (in the misc menu).

Navigate to the correct DCIM subdirectory, select/unselect files with "right" arrow button, press "left" for a menu of available functions and select "Delete" (using the "up" and "down" arrow keys) and press "func/set" delete (or "left" to exit the menu).

Re: Can't delete files from my sdhc cards after use in Canon SX20is
« Reply #2 on: 09 / September / 2011, 18:59:17 »
I have an SX120 with WinXP.   sx120is-100b-0.9.9-912-full  -- SD card reader adapter to USB.
My camera has worked fine with CHDK for months, no new software.
   I'm having a similar problem, my almost full 4G SD card shows as write protected. The write protect tab works on-off OK in the camera, (splash screen, alt mode, etc) but it acts like the tab is protected when I try to delete or save/modify files.  (Yes, I have a few RAW pics.)

(FYI, one web search answer says it's a registry error, but other SD cards seem fine. It seems like this one card only has somehow been protected (similar to a format?). )

Two questions.  1) Is there a fix?  2) Is there a work-around such a way to mass-delete (say, a folder,) from a camera menu so I can reuse it?

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Online reyalp

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Re: Can't delete files from my sdhc cards after use in Canon SX20is
« Reply #3 on: 11 / September / 2011, 23:24:18 »
Quote
The write protect tab works on-off OK in the camera, (splash screen, alt mode, etc) but it acts like the tab is protected when I try to delete or save/modify files
Do you mean you can't delete files in the camera, or only using the card reader ?

If the write protect tab works in camera, but not in the card reader, it's possible there is a physical issue in the card reader. The write protect switch on the card is just a piece of plastic. The card reader and camera have a little switch that detects what position that piece of plastic is in. It's possible for these switches to get stuck, or not engage properly depending on the exact position of the card or how close to spec it's shape is. If this is the case, you may be able to get it to work again by finding some small item to wiggle the switch in the card reader.
Don't forget what the H stands for.


Re: Can't delete files from my sdhc cards after use in Canon SX20is
« Reply #4 on: 12 / September / 2011, 15:34:03 »

Thanks! I'll get another card reader.  Yes, I could delete from the camera.

It started working when I reseated the card...very carefully and "handsy" as if I were picking a lock.  I expect it to go bad again any time.  (Other cards work fine in that reader.)

(Before that I noticed the drive properties showed more bytes written than the card could hold, even tho it also showed 50-100M free space. So I deleted all my movies, freeing up 25%.  But no immediate fix.)

And extra thanks for explaining the plastic switch!  VERY useful NTK!   In closer inspection who knows? a dab of Epoxy or some such hillbilly reengineering might be called for.

 

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