The cache files are under cache partitions. The working directory you specify on the Set Cache Specifics page is often the parent directory for the cache. All cached files appear in an organized directory structure under the caching directory. If you change the cache directory name or move it to another location, you have to provide the proxy with the new location.
You can extend the cache directory structure to multiple file systems so that you can have a large cache structure divided on multiple smaller disks instead of keeping it all on one large disk. Each proxy server must have its own cache directory structure, that is, cache directories cannot be concurrently shared by multiple proxy servers.