The way this is worded it is confusing as to what to set the value to.  Maybe something like "prevents new data to be persisted to the cache store."

All the rest of the values were written as if it was enabled, so it seems a little more consistent.

Also the remaining paragrah is a bit cludgy.  I understand what you are trying to say, but I would think it could be quite confusing if you aren't familiar with the case.  Maybe something more generic like "A typical usage may be if you have 2 stores and you only want to update 1 of them you could set this to true on the other store."  or maybe something talking about a read only file system?