Fast Help.. (low disc space)

Look I posted this in another topic but can someone please help me out cuz its on my mind..
I was running low on disk space (Ive been using LW way too much & cant [art with any of my files :P) so I decided to look around on the net to see if there was another way to free up space (I didnt get much out of disk cleanup. Never have.) But I was reading that you can disable hibernate mode.
So I did this. I got lots of free space out of it (something like 500MB lucky me..)
But is it safe to turn off hibernate mode?? I dont think I ever use it because I usually just shut down my PC or put it to sleep if Im not going to be gone for long..
Please help me out.

Thanx.

ps. This may have been the wrong place for this thread but i need answers right away. So sorry if im wasting anyones time.

Get a removable hard drive, It solves storage space mine cost £70 & gave me
250gig, just plug it in the USB when you need it.
Job Done.
Peace.

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mickjapa108