Occasionally, and for no apparent reason, my Macbook Pro's hard drive will fill and spit out severe errors relating to a lack of disk space (also the CPU winds up and the fans start spinning). By occasionally, I mean once in a couple of months, so this isn't a chronic problem but I never know when the machine is going to freak out. A reboot puts everything to rights so I suspect it has something to do with Time Machine backups. Usage doesn't seem to matter. This problem happened as my daughter was doing some very light homework on the machine. Any tips on where to look and what may be going on? Model Name: MacBook Pro Model Identifier: MacBookPro6,2 Processor Name: Intel Core i5 Processor Speed: 2.4 GHz Mountain Lion 10.8.4 8G RAM Samsung 830 128gb - w/o TrimEnabler and the machine is always left on . Thanks.