Never had to defragment my old mini in the 3 years I had it and that was with a 320 gig drive partitioned 200 mac 120 windows or thereabouts. Never even thought about it as was always told that with OS X you didn't have to.
Only had my iMac 6 months. It's internal split 500 each OS X and windows. External drive for movies and stuff. OS X partition always got more than 100 gigs free. Nothing weird done on it. All downloads go onto external.
Noticed drive making a lot of noise. Ran techtools on it. 1000 files fragmented big and small. Biggest contiguous space 2 gigs. Techtools couldn't even run volume optimisation until I moved most of my steam games to the external drive to make enough space.
Few hours later it's almost finished....
Only had my iMac 6 months. It's internal split 500 each OS X and windows. External drive for movies and stuff. OS X partition always got more than 100 gigs free. Nothing weird done on it. All downloads go onto external.
Noticed drive making a lot of noise. Ran techtools on it. 1000 files fragmented big and small. Biggest contiguous space 2 gigs. Techtools couldn't even run volume optimisation until I moved most of my steam games to the external drive to make enough space.
Few hours later it's almost finished....