Although in the past I have had this occur once in a while, recently I had hundreds of images become corrupt with the same message. At the same time, I was also getting an assortment of other error messages but all were stating about the same thing. The .jpg images could not be read. In addition, at this same time, (and from the same photo session,)

Most of my .tiff images became corrupt after I had converted them from RAW format. Along with about half of those of the RAW format were unreadable.

Of course the first problem I thought it was, was the digital camera, or the card reader or maybe the memory card.  Unless something very unusual took place on that day of photographing, there was and is nothing wrong with any of the camera devices.

After thinking for a bit, I realized I was also having the .tiff problem in other folders, with images that had been scanned and never came from a RAW format. After moving folders from one drive to another, (I thought it might be the external drive). I did some disc utilities on the external drive. (this is where I keep most working images before I burn all onto DVDs.

After doing the disc utilities and then defragmenting. I also ran Gary’s Utilities (the free version).

In addition, I cleaned up my folders and did basic house cleaning on that USB External drive.

Once all of this was completed, I stopped having the problem with any additional images. However, I do believe those that received the error message, along with the garbled .tiff and unreadable RAW images, well, I have as of now deleted all of them. (A virus? Who knows).

I have spoken to the customer support of the manufacture of my external drive, and he told me that nothing from a hard drive could cause this problem. I think I tend to believe these problems come from drives needing utilities done, a registry problem or things along that line. Just goes to prove, “Back up – Back-up and Back-up” This way you are always protected

Try open the image in any browser, then save it once more... (rtclick> saveas)

It will be cleared.....

I've recently been having a similar problem. Here's the scenario. I take a photo, upload them into iPhoto. I edit that JPG in Photoshop no problem. I'm usually taking out backgrounds and saving them as PSD files to keep layers. I'm then putting that PSD back into iPhoto for storage. Now here's the problem. When in iPhoto I right click on the PSD file and choose 'Edit in External Editor', Photoshop comes back with "Could not complete your request because an unknown or invalid JPEG marker type is found". This only recently started happening and am not sure why. But its annoying.

Photoshop CS3 v 10.0.1

iPhoto '11 9.1.2 (605)

System: iMac, OS 10.6.7, 2 GHz, 2GB RAM

I had a card not recognised message in camera and in card reader.

Retrieved approximately 90% of my photos off the card.

Better than the none I had before.

Don't want to scare you off but first it is a bit off topic in a Bridge Forum,

second, you are in the Mac section and the solution you provided is Windows Only

Third observation is you did copy the hyperlinks but they don't work because you have twice "http" added

If you use San Disk CF, they have an excellent app called Rescue Pro, not free but cost far less then losing the content of a CF card.

Don't know how you use the CF card and how you import the files but here is what I do:

Always use a separate card reader and Adobe Photodownloader to ingest the files in Bridge (I also convert to DNG, rename, back up and add metadata template with this action in one go).

Then I check the thumbs and try some of them in preview to see if they are working correctly.

Now having one DNG file on my main disk and the original CR2 file (I never use jpeg in camera) as back up on a second disk I can safely format my CF card. And I always use the format card option instead of delete all.

Only the first CF cards have let me down sometime because I did not eject them correctly from my system. but they where only 128 MB in size and that was back in 2001, things where a little different then...

Up to the last 7 or 8 years I did not have any failure with my CF cards from several vendors (Mostly Lexar and Sandisk btw)

Mac users tend to help Windows users with replies like "Why do you want to do that".   I prefer the hermetically sealed!  

I prefer the hermetically sealed! 

Why do you want to do that...

I agree with TomGroupA.

Apple Preview, free, opens these files like a charm.

Photoshop, $800, balks at 16 bit????? format it saves in?

What good is a super-duper high-end graphic editor with a bazillion bells and whistles that can't open a file?

Jay Gamel