Can't import Cr2 files from my Canon 60D into LR5

Question

I took a trip to New Zealand and I shot in Raw +low res jpeg.  I uploaded the files to my little Asus tablet I had purchased right before my trip because I was running out of SD cards.  This is the only place I have quite a few images as I formatted the cards to reuse them.  I have transferred them to an external hard drive with no problem and then to my main PC which has LR5.  It doesn't seem to 'see them' when I try to import.  Any ideas? I tried opening one of the images directly into Photoshop CS6 and then I saved it as a jpeg file - then I was able to import it into LR, but I have 100's of photos and not sure I can do a bunch at a time, but at least all is not lost.  Thanks for any help anyone can offer.

Answer 1

When you say "grayed out" do you mean a gray area instead of a thumbnail as can happen when the monitor profile is bad or do you mean the thumbnail is dim and washed out to indicate an image that cannot be selected as they would be if they had already been imported into the catalog?
You talk about shooting RAW+(low-res)JPG but no where to you talk about what happened to those JPGs.   Did the JPGs remain on the tablet when you transferred things to the external hard drive prior to attempting to import or are they on the external hard-drive, too?  Are you importing them along with the raw files, but have Treat RAW+JPG as separate files unchecked, so the JPGs have become the sidecar file to the CR2s?   The size of the companion JPGs shouldn't matter as far as what happens with the CR2 files when you work with them.  They take up space on the card and the tablet memory but I guess you wanted them so you could review your pictures on the tablet since the CR2 files are not processable on the tablet so wouldn't be visible.
Have you imported your camera's raw files into LR before?  What is different this time from previous times, the source of the files, or the fact the files were on a tablet, or that there were companion JPGs, or the type of import is different because you usually import direct from the card?   What type of import did you do, Add, because the files are supposed to stay on the external drive as the normal place for your images, or Move (or Copy) because the photos end up on an internal drive, normally?
When you open the JPGs in Photoshop, do they first open in Camera Raw or do you not see the ACR plug-in and they open straight in Photoshop?
When you say the saved JPGs out of Photoshop are 1/5th the size, do you mean pixel-dimensions size where a normal 4000x3000 image becomes 800x600, or that the file-on-disk size is of the CR2 files is 25MB but the JPG is only 5MB on disk?  Images don't just become smaller in pixel dimensions without a resize happening, and it is perfectly normal for a JPG file to be much smaller on disk than the original raw file, since JPG files use lossy compression. 
The imprecision of terms "grayed out" and "size" is confusing to me.  I worry that somehow you don't have any CR2 files, only small JPGs, or that the CR2 files became corrupted because they were put on the tablet since you've never done that before.  Can you provide an example CR2 file, uploading to www.dropbox.com and post a public download link, here--a file that you don't mind others seeing, just so it can be checked for corruption?