I recall seeing the one you mentioned also saw this one where they say, " This is the partition where Android stores frequently accessed data and app components. I've tried numerous times to get a good explanation of what is stored in the cache partition. Actual support sites also suggest it as a potential solution, like Motorola: Perhaps it's just a placebo effect, but I've seen improvements in performance after a cache partition wipe if things were getting glitchy. I believe the dalvik cache can't be cleared in an unrooted device, correct? So wiping the cache partition from the Recovery Menu would be the other cache partition that you referenced.
Thanks for your input-I'm not an engineer, so I go by what I read, and what others experience and what I experience. If you're phone is running sluggish, clearing these 2 is also a quick and easy step you can take to see if rebuilding the app optimization files can improve performance. This is good advice and I certainly don't disagree with it, but chances are that it's actually the clearing of the dalvik that is most important. Generally, if you're rooted and installing ROMs or other mods in recovery, it's always recommended to wipe both the /cache and the dalvik cache at minimum before installing anything. It also doesn't really free up any space either, because it's mounted as a separate partition, and thus always uses the same amount of the total disk storage space. wiping the cache partition generally will have no noticeable effect to the end user. So, the /cache is basically just a temp directory used by the system for downloading temporary files it needs when installing apps and such. In fact, upon Android boot-up, the script will clear out the /cache/downloads to make way for any new downloads/updates from Google Play Store. So really, there is no loss of data from clearing it.
There is also another directory in there called lost+found which holds any recovered files (if any) as a result of file-system corruption, such as incorrectly removing the SDcard without un-mounting it. It also can hold the recovery log found in /cache/recovery called last_log as well (this holds any errors and/or diagnostics from the recovery binary a la CWM or stock, which will get logged in the file to aid debugging and development of the recovery binary). cache partition is mostly for saving the downloads from Google Play Store, found in /cache/downloads.
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