My initial thought is that your 100K files are maxing out a cache size before the 100K files are processed. However, in looking at the app preferences and catalog preferences I am not seeing where such a limit would be set.
I think I did everything correctly. Moved pictures to the external drive as per Microsoft's instructions for Windows 8. All worked fine. Everything else in Lightroom seems to work fine. However, it just stopped creating standard size previews.
Were you able to Import all 100K image files successfully into LR? In the Library module's left panel under 'Catalog' what number do you see next to 'All Photographs?'
The little message in the upper left corned stopped moving forward with the number of files processed for standard previews. That message disappeared completely. But now, a couple of days later, files open quickly to a full-screen view. I suppose that Lightroom quietly kept processing them in the background. How can I tell if a photo has a standard preview? Should it open to full screen in a flash? IS there any metadata to show preview size. How can I make sure.
By the way, thanks for the input to this newbie.
All 100000 of them were happily imported. Thanks.
Glad you had success. You can check to see how many preview files have been built by checking the Lightroom 5 Catalog Previews.lrdata folder with File Explorer:
/Users/[user name]/Pictures/Lightroom/Lightroom 5 Catalog Previews.lrdata
Right-click on the folder and select 'Properties.' Next to 'Contains' will be the file count representing the number of built previews. It should be the same as the number of pictures (100,000) or slightly more.
Creating previews for 100,000 image files will take a long time! My Windows 7 i7-860 processor system with 21 mp Canon 5D MKII raw files takes about 3 seconds to build one standard preview. Using this number for 100,000 previews:
100,000 x 3 seconds = 300,000 sec. = 5,000 min. = 83 hours = 3.5 days!