Photoshop uses a lot of RAM. It will take as much as you can throw its way, and then some more. As a way to use ‘more’ RAM than a computer had available physically, the developers took to creating scratch disks on your Hard Disk Drive (HDD), as an extension of the data that Photoshop held in RAM.
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If you don’t do this one thing, you will lose all your edits when your lightroom catalog file gets corrupted.
This is the one setting that I always turn on as soon as I install Adobe Photoshop Lightroom (LR) on any computer: Automatically Write Changes into XMP.
I suggest you do the same, because it has saved me many times. I really don’t know why Adobe sets this to ‘off’ by default. It should always be turned on! Here’s how to turn on
Read moreHow-to Save RAW File Edits Without a Lightroom Catalogue file