File corruption?

[Whistle]

Is there anyone who has file corruption for big JPG files?
I can't say if some of my pictures are corrupted because of MyDefrag 4.3.1 or another software
I just noticed that some of my picture don't fully render now. While looking at them in explorer (thumbail view), everything seems normal but opening them show something wrong.
I use MyDefrag in replacement of a screensaver.

Any one had similar problems?

[Darlis]

The file is incomplete, so something prevented it to get copied fully from one place to another. Since MyDefrag uses the Windows Defragmentation API, it itself can't be the cause. (See [FAQ] How safe is MyDefrag?)

There can be multiple causes for that: faulty hardware, drivers, or security software. You should check the SMART status of your disk with HDTune or CrystalDiskInfo first.

The Thumbnail has been calculated before and saved in another file, so it is independent of the actual image.

[BloodySword]

The Thumbnail has been calculated before and saved in another file, so it is independent of the actual image.

The Thunbnail is in the EXIF header of the image, this header is at the beginning of JPEG files. Read the JPEG and EXIF data sheets for more info.

BTW: Viewers also might cache the thunbnails for faster showup.

[Darlis]

The Thunbnail is in the EXIF header of the image, this header is at the beginning of JPEG files. Read the JPEG and EXIF data sheets for more info.

I know about the EXIF information and also that it is completely optional. I don't know if the Explorer respects this information, I think it would just create it's own thumbnail and stores it in thumbs.db like every other thumbnail.

[BloodySword]

The Thunbnail is in the EXIF header of the image, this header is at the beginning of JPEG files. Read the JPEG and EXIF data sheets for more info.

I know about the EXIF information and also that it is completely optional. I don't know if the Explorer respects this information, I think it would just create it's own thumbnail and stores it in thumbs.db like every other thumbnail.

Since XP SP2 (or even older) it does respect this thumbnail, it does not shrink the image in full resolution, it searches for the smallest thumbnail in exif (there can be more than one!) but wich has greater or equal dimensions like the thumbnail to be created. Then it saves his own one in thumbs.db.

[Whistle]

The file is incomplete, so something prevented it to get copied fully from one place to another. Since MyDefrag uses the Windows Defragmentation API, it itself can't be the cause. (See [FAQ] How safe is MyDefrag?)

There can be multiple causes for that: faulty hardware, drivers, or security software. You should check the SMART status of your disk with HDTune or CrystalDiskInfo first.

The Thumbnail has been calculated before and saved in another file, so it is independent of the actual image.

Thanks, I will check my disk status