Re: Too much hentai?
I'm not actually sure how much hentai I have, due to the way I keep it hidden. It is more time consuming, but for hidden-ness there is almost no substitute (other than keeping it on a hidden physical drive, but as XSI's plight pointed out, that has it's own problems).
Put the hentai into a zip. (This is not necessary but important when the collection grows and you have 200~individual files and cannot remember what each is.) Put the zip in the folder for a game you will never share or uninstall. Alternately it can go in the same directory as any large program - ISO's for games you will never install or already have installed are good ones, as long as you don't want to share them. Rename the zip file to be in line with the names for the other files, for instance DXP2Data-Extra.sga in Dawn of War's DXP2 folder. Try to keep the zip the same size as the files it is around.
Ways to notice it - if the file is supposed to be text readable, it will not be when converted into a text document. The file creation date and time will not be the same as the rest of the files. The file will not remove when uninstalling the program. However, as long as you don't uninstall the program, the rest of these ways require going through each file in each game and checking the time created, which is very difficult and certainly not something you would stumble upon accidentally. You do have to clear your recent documents and history, of course, but that is a given for any hentai hiding scheme.
Problems: It is very time consuming to view a zipped dojin without extracting. Everything watched has to be unpacked before it will run. It is very time consuming to sort and add new things to categories, leading to a large number of zips with muddled contents. You can forget where everything is, though you could just keep a list of the locations and file names in a similarly hidden document, that way you only have to remember the location and name of one file.
This hiding in plain sight method removes the need for suspicious things like hidden folders or passwords, and if not used for everything, is still a good way to hide that favourite bit of hentai that you really don't want to risk loosing.