Hello all - I've read on the forums that some users have experienced file corruption they attribute to Lightroom, while others in response insist Lightroom cannot alter an original raw file in any way. That said, it sure seems to me that Lightroom is somehow corrupting some of my Nikon NEF files.
This appears typically as lines of "ripped", blocky and unregistered color across the image left to right in horizontally formatted NEF files, as an example. Some portion of the image may also be missing and appears white on screen. These were files shot in the field and originally imported to a laptop, backed up to external drives, and one of those drives used as the source for import into my desktop editing machine. The corruption occurs after ingest into the desktop, and seems to happen randomly.
On occasion I am able to discard the preview for the corrupted file and regenerate a preview, which in turn reveals the image is in fact okay. However, as I encountered this afternoon, the regenerated preview results in no change to the apparent file corruption. I took this file into One One Photo Suite software, and it originally showed a preview JPG as non corrupt but when I selected the image to edit full screen it would not read the file. I took the same file then into View NX software where its preview again appeared fine in the grid view, then fine again when I brought the file up on full screen to edit. I output a TIF version of the file from View NX and the output TIF exhibited the same visual corruption as I found initially in Lightroom. When back in View NX, I select the RAW button in the upper left corner - this seems to generate a new preview in View NX and indeed the new preview file appears corrupt.
The original file on the laptop and on its external backup drive check out okay - I re-ingested them to a test folder on the desktop, and they read fine in View NX and in Lightroom. So the problem occurs on my desktop sometime after ingest from the laptop (I know this because the file was appeared a-okay after that laptop to desktop ingest, but now - a couple of days later - it is corrupt on the desktop harddrive).
I've checked and rechecked the desktop harddrive (a 4tb drive) and it checks out okay.
It sure seems to me that Lightroom must read the original NEF file in order to extract metadata as well as the JPG preview file from it. I don't see any other way for Lightroom to bring that information into its catalog, so my assumption therefore is that Lightroom in fact accesses the original NEF file to do this. If it accesses it at least reads the file and my thought is that action must somehow corrupt the file data on random images, or perhaps in the process of extracting metadata and writing sidecar XMP files, as I've set my system up to do that by default.
BTW this has occurred most recently on D7100 camera files as well as my new D810 camera files. The file in question came out of the D810.
Any thoughts or suggestions would be appreciated.