Scracth disk is full

This error means you that the scratch disk is full. to fix this you should clear your disk space. or you may visit at https://www.adobesupportphonenumber.com/blog/fix-photoshop-scratch-disk-full-errors/ you can see your solution here related t this issues.

I do this simple trick every time how to fix scratched cd cheap

I haven't encounter this problem in photoshop yet.
But I have read in some sites about scratch disk.
Here's the address http://graphicssoft.about.com/od/photoshop/f/scratchdisk.htm

Read and you might see the solution.

The Photoshop scratch disk is your hard drive. Photoshop uses your hard drive as temporary "swap" space, or virtual memory, when your system does not have enough RAM to perform an operation. If you only have one hard drive or partition in your computer, then the scratch disk will be the drive where your operating system is installed (the C drive on a Windows system).
You can change the scratch disk location and add multiple scratch disks from Photoshop Preferences. Many power users like to create a dedicated hard drive partition for the Photoshop scratch disk. Although Photoshop will function with a single scratch disk on the system partition, you can improve performance by setting the scratch disk to be the fastest drive in your system. Other useful guidelines for setting scratch disks are to avoid using the same drive where your operating system is installed, avoid using a drive where the files you edit are stored, and don't use network or removable drives for a scratch disk.
If Photoshop is shut down improperly or crashes in the middle of an editing session, this can leave fairly large temporary files behind on your scratch disk. Photoshop's temp files are typically named ~PST####.tmp on Windows and Temp#### on Macintosh, where #### is a series of numbers. These are safe to delete.

If you're getting an error message that the scratch disk is full, it means you need to clear some space on whatever drive is defined as the scratch disk in Photoshop Preferences, or add additional drives for Photoshop to use as scratch space.