Follow instructions from these links:
http://osxdaily.com/2012/11/11/tips-free-up-disk-space-mac-os-x/
http://www.chriswrites.com/10-tips-to-free-up-hard-drive-space-in-mac-os-x/
if Disk Utility still reports Other size as "surprisingly" large
Use Terminal.app
Enter (type in) these commands
1. du -sh *
Note: you might want to pay attention to Library directory
CAUTION: you may lose some important data if you don't pay close attention to what you do here!
2. cd Library
3. du -sh *
Note: check output and see which directory is disproportionately large e.g. over 1 G(igabyte)
Note: repeat 3 as you move into subdirectories that are large
5. CAUTION: you may lose important data in this step, it cannot be recovered from any "Trash" !
rm <file>
Even more Deep Dive
if Disk Utility still reports Other size as "surprisingly" large
CAUTION: your system can be rendered unbootable or you may lose some important data if you don't pay close attention to what you do here!
1. sudo i
Note: enter password to become "root" user
2. cd /
Note: best to cd into /Applications, /System, /Library
3. du -sh *
Note: check output and see which directory is disproportionately large e.g. over 1 G(igabyte)
4. repeat 3 as you move into subdirectories that are large
5. CAUTION: you may lose important data in this step, it cannot be recovered from any "Trash" !
rm <file>
