That’s more or less the solution I chose after writing this article, and why I added the note about MD5 at the end. All those MD5 hashes are pretty useless, and I was surprised to discover that this is a very common method in caching schemes. Oh well!

avoid md5 hashing and instead break the ID into 2-digit splits; ex:

/posts/show/5698549 would be cached into a
posts/show/56/98/54/9.html file

this way no directory would get more than 100 entries