I'm in the market for a new laptop. I think the new Macbook will meet my needs, but I'm unsure about how big of a hard drive I'll need. In the past, I've purchased laptops with larger hard drives as I don't want to run out of space. I currently have about 125 gb on my hard drive and I keep everything on it. I've heard that it's a good idea to make sure that there is "ample" free space on a hard drive, not just to keep it from filling up too quickly, but to ensure that it runs most efficiently. How much free space is needed on a hard drive to keep it running quickly? Is it a specific amount of free space that's best (e.g., 10gb) or rather a percentage of the total capacity of the drive (e.g., 10%, so of a 256gb hard drive, ~25gb should be free)?