i have a mini that i got in '12 that is running 10.7.5, 2.3 GHz w/2GB RAM. when i use the mouse lately it's doing this weird thing where the mouse/cursor will randomly disappear and then reappear somewhere else on the screen. when my other macs do this, i simply run Disk Warrior and the problem seems to go away. well, the mini doesn't have a cd drive and Disk Utility does nothing to fix this (says there are no problems found), so what are my alternatives for hard drive maintenance? 