Photoshop has a built-in performance optimisation feature where it will automatically get rid of unnecessary cache files. While those have limited storage space too, at least your Mac will not be too cluttered to perform Photoshop projects. If you are struggling to get rid of any files, consider using an external cloud storage for them instead, such as iCloud or Google Drive. If you click 'Manage' below, you will be presented with the Optimise Storage feature, where you may choose to clear up the clutter in different parts of your Mac. Here you can see how much space is already used up in your device.

To clear your disk space, open up your Apple menu → About This Mac → click on the Storage tab. We get that it's easy to forget about it and let your Mac get cluttered, though. Ideally, you would follow the 15% rule - meaning that your storage always has around 15% of free space. Therefore, the best thing to do is regularly clear it out of all unnecessary files. The main reason your Photoshop is having to use scratch disks for additional memory, is because your internal disk has run out of space too. Here are some simple ways to fix the 'scratch disks are full' error on Mac.

This additional storage will soon fill up too, typically with temporary files that are being automatically created as a way to back up different versions of your projects while you are working on them. The scratch disk in your Mac is essentially a hard drive space that Photoshop uses for extra storage, when your RAM has run out of memory for it. Anyone that regularly uses such programmes as Photoshop on Mac have encountered errors relating to the scratch disk, at one point or another.

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