how do l know where most of my mbpr HD usage is?

[Appletise]

l get the warning "your startup disk is almost full" l want to transfer many of my files to my 1TB external HD so that I get at least half my HD space free.
thanks

 

[MagicBoy]

Click on about this Mac and it will break it down by file type on a nice chart for you.

 

[thejasonhowell]

l get the warning "your startup disk is almost full" l want to transfer many of my files to my 1TB external HD so that I get at least half my HD space free.
thanks

Disk Inventory X, a free app, can tell you where and what files are taking up the most space.

http://www.derlien.com/