Lightroom (5.7) isn't recognizing the RAW originals on either of my external drives where I've stored them for a few years. I fear I did something to create the problem, but not sure wha,t and I'm not sure what to do at this point. My routine file management steps are as follows: store each shoot's photos on the laptop's hard drive, create smart previews after weeding out the bad stuff, move original files to an external drive when the laptop's storage capacity approaches 75% or so, work with smart previews when processing photos. It's been a year or so since I needed to transfer files from the laptop to the external drive. When attached to the laptop, LR would not recognize (or could not find) the "RAW and LR" folder storing the originals. Both external drives were connected (one is a backup). One external drive has several "RAW and LR" folders (see screenshot), which are older backups.
Also, I've not been able to find a large majority of the my 2017 files on either external drive. I still have the smart preview version on the laptop, and that's all I've really ever needed. I suspect the originals have been deleted somehow.
Several months ago I renamed some of my photo folders on my laptop via Finder. From what I recall, these folders didn't have any connection to LR.
Here's a few screenshots.
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