If you are searching for ways to hide your harddisk contents ,you will find ways like encrypting your harddisk,using folderlocks etc which are a little clumpsy to implement .Ya, here is a little trick everyone can do without paying even a penny for softwares.Here it is:
step 1. zip /rar your data which is to be hidden .
step 2.Select your picture where you need the files to be hidden.
step 3.Pull up your command prompt (from run :enter cmd).
step 4.Move to the directory where you have your picture and data to be hidden (cd \foldername).
step 5.Now type :”copy /b myimage.jpg + filetohide.rar myimage.jpg”
step6.You are done.If you need to see the files you have hidden ,click on the picture and select open with ,select winzip /winrar or whatever and extract the files.
step 7.In linux you can use cat command .ie, cat file1 file 2
You can hide any type of file this way let it be .wav,.avi ,.mp3,.pdf ,anything.If you need to hide multiple files compress them a single file.