External Hard Drive not showing up in Scratch Disk options

[aidanf7932759]

Hello all - 

I've been using Photoshop CC on my Macbook Air for a while now. My system is a 2017 Air running Big Sur (11.3.1). up until today I've had minimal issue setting my WD external hard drive as my scratch disk. Today it just wouldn't show up in my options for selecting a scratch disk - and because my computer is running really low on space (<3G), I can't open PS to troubleshoot from the inside. I've reset the settings using Shift+Command+Option, and I've checked that my external is running MacOS extended (journal), and it still won't work. I'm a bit at wits end over here - any help would be greatly appreciated! 

[Mohammad.Harb]

Have you tried restarting your mac and changing the  USB port ? 

[aidanf7932759]

Yes I've tried both ports - neither seem to show up for PS. the external shows up in Finder though - I can access my files, I just can't load anything into PS 

[War Unicorn]

Damaged preferences, maybe? Did you try resetting them?

https://helpx.adobe.com/photoshop/using/preferences.html

(Take note this will nuke all preferences; you'll have to reset everything to the way you had them before.)