Images recently were non-readable on the computer, corrupted files. The long version: Newly purchased D80 w/kit lens 18-55 (I know, I need to add!!). Several shooting outings successfully downloaded via sandisk usb card reader, including shots using my old nikor lenses in manual mode. Yesterday, shot a series of test images using kit lens, my older 35-105 f3.5 nikor zoom and an f5.6 300 mm tele. I judged exposures on the latter using the histograms in camera play mode, so I KNOW many if not all the images were there on card before leaving the field. Got home, placed card in reader, copied fine, but mac OSX only generated thumbnail for icon on first image. Photoshop CS2 and graphic converter refused to open jpegs and CS2 wouldnt open the NEFs, saying unknown file type. The file sizes looked right, about 3M for the jpgs and 7 for the raws... (camera set to record jpg fine and raw). So I thought 'transfer problem', trashed the folder and attempted to re-copy, and mac OSX reported an error, couldn't copy files. Placed card back in camera and camera played only the first image, for the rest displayed "no image data". I shot a pic in my study which displayed fine in the cam and copied ok to the mac. I thought it possible that I would have turned the camera off while last image was still writing (doubt it, but...), but why should that have left 1 file (pair of files) unaffected? So any thoughts on any testing that should be done, should I just assume its a card problem(new Lexar 2 GB) and format it (I had formatted just before heading out), switch to sandisk or other brand cards... just wait and see if it happens again????? would hate to lose a whole day's real shooting! .... mac G5 1.5 gig ram, usb sandisk card reader, photoshop CS2, lexar 2GB card... thanks in adavance, peter