well its not quite free hanging, it is rested on the case but not completly FLAT,
there is no chance of the power or ribbon cable comeing out,
so im guessing it is ok...
but im not ENTIRELY sure lol

thanks  X HORIZONTAL or vertical is best...on an angle = no good.Why not mount it properly?I was going to ask the same thing.It doesn't need to be secured to work properly, but six months from now I could see someone forgetting the HD is loose and move the case, and the HD would be thrashing around INSIDE the case.If this is a space issue inside the computer why not purchase an external HDD case and install it in that? They are very cheap and you are inviting a problem with it not secured and inside something.truenorthHe may not have space issues at all...is possibly just doing this temporarily and wanted to know if there are any ill effects...True, so let's ask him/her. truenorthHmmm. I  am lookin' over your  original post...
What are you talking about? What problem?
Hanging out?
Don't we all hang out sometime?
http://geek9pm.com/art/MY_LAB0001.jpg   
That's it by golly ! !