add external hard disck on stratch disk

[clint0D45]

can someone tell me how can i add external hardisck to load in scratchdisck pls

[lambiloon]

Hi I think external drive cant load as a scratch disk but you can check in preferences for it...regards

[JJMack]

Windows or Mac.  On Windows 10 I have no problem I just  configure my external USB 3 4TB disk  E: in my Photoshop Preferences  instead of my C: SSD.  As long as I have 100GB free on my C:  I will use the SSD for scratch space. Thet ats startup shortcit start PS Press and hold Alt+Crty.

[clint0D45]

Even i i had 2 external hard disk and when i press comand and control during startup it does not showing my external hardisk in scratch 

[Ged_Traynor]

How is the external hard disk formatted and how is it connected to the PC

https://helpx.adobe.com/photoshop/using/scratch-disks-preferences.html