So, I have an Alienware laptop, which is absolutely retarded. I'm going to sell it because I have no use for it. I do, however, have use for my 1TB mybook external HD which is most than half full.
If I get a mac, will I be able to use my HD without formatting it?
Not with out some way to read NTFS file systems. I use Tuxera NTFS, but there is other options out there.
Uh, what? OS X can read from an NTFS file system, but it cannot write to NTFS. I'm assuming that is what Alfy meant.
So if you got a new MAC, you could pull all of the contents of your external with no problem. Then you could do a quick format (OS X makes it hilariously easy) of the external in a format that OS X can write to natively, and move your files back.
That or you could pursue an option like Alfy mentioned, but I prefer to do it natively.