I use windows but see if the this works for you. Close down Photoshop. The start Photoshop and immediately press and hold theCMD+Option keys. You should get a popup dialog the looks something like this and be able to change your scratch disk configuration. JJMack. 1 Upvote.

Watch the Efficiency indicator to monitor performance while you work in Photoshop. Click the pop-up menu at the bottom of the image window and choose Efficiency from the pop-up menu. If the value in the indicator is below 100%, Photoshop has used all available RAM and is using the scratch disk, which slows performance.
1) Go to Mac icon on the upper left corner. 2) Click on About this Mac > Storage > Manage > Documents. 3) Click on "Incompatible Apps" or something like that (I have it in Spanish) 4) Delete every file shown there. Most are from Adobe. 5) Now try to open Photoshop ad it must be solved. For me it worked. Note: If Photoshop cannot launch because the scratch disk is full, hold down the Cmd + Opt keys (Mac) or Ctrl + Alt keys (Windows) on launch to set a new scratch disk. I was able to reset the scratch disk and so far Photoshop is launching fine. Hope this helps someone! Explore related tutorials & articles. Windows reads the SD card as an removable device so if you connect the SD card to your computer, remove the C: drive as a scratch disk and then restart Photoshop, the SD card should be detected. However all cards might not be supported based on the storage, so you might have to format the card and then use it. If you use an external hard drive, make sure you keep it plugged in. You can change the location of your scratch drive in seven easy steps: Open Photoshop. Select “Photoshop”. Select “Preferences”. Choose “Scratch Disk”. Select the drive you want to use. Select “OK”. Force-close the application and re-open it.
Choose Edit > Preferences > Scratch Disks (Win) or Photoshop > Settings > Scratch Disks (Mac). In the Preferences dialog, select or deselect the active check box to enable or disable a scratch disk. To change the scratch disk order, click the arrow buttons. Click OK . To apply the changes, restart Photoshop. Lưu ý:
JSRRcm9.
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  • how to change scratch disk in photoshop