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The file may be being stored in
A. a format the camera can store in but can't read ? this is very unlikely!
B. a corrupted version of the format it is supposed to be stored in.
C. the camera is unable to read/decode the usual format, owing to breakage of the decoding or format recognition etc.
The best way to settle which of these three is the case, would be to take the card the pictures are stored on, to a computer, and try to read the pictures there.
- if the pictures read fine, (B) is not the case. And dependent upon what File Type the pictures recently taken turn out to be, it might be (A).
- if the pictures don't read fine on the computer either, then (B) may be the case very likely.
'appear' on the computer.... um, what exactly does that mean? did they fail to open? or were they just not found at all?
How did you search for them?
Puzzling. But what are the File Types of the files that 'appear'? and the ones that don't 'appear'?
File Type can be told by right-clicking on the file icon, then choosing Properties, and looking for File Type on the General tab of the Properties. (This, when the files are examined on a Windows PC.)