From the sound of the description, it is one of two things: Log Files - Unlikely, wouldn't shrink back when rebooting Virtual memory cache - Likely, grows and then returns to normal size on reboot. Now it will take a better Mac expert than me to explain the virtual memory setup on a Mac. cjc On 25/01/2008, at 10:59 AM, Brett Conlon wrote: > Does WhatSize search for hidden and system files too? > > If so then all good, if not I'd be using a search tool like EasyFind > (or other like Find utilities) to search for all files (including > invisible & system) modified on today's date and look at the items > at the top of the list (including their sizes. > > That might give you a solid clue as to what the files are and where > they are coming from. > > Cheers, > > Coj > > On 25/01/2008, at 4:07 AM, Robert wrote: > >> Hard drive is still running like crazy. A minute ago it was down to >> 24 gb and now its gone up to 36.56 gb and is now starting to drop. >> With in 15 seconds it has dropped down to 34.81gb. Bob >> _______________________________________________ >> X4U mailing list >> X4U at listserver.themacintoshguy.com >> http://listserver.themacintoshguy.com/mailman/listinfo/x4u >> >> Seven Cent Deals - Great legacy stuff Great Legacy Pricehttp://www.drbott.com/prod/db.lasso?cat=Seven+Cent+Deal > > _______________________________________________ > X4U mailing list > X4U at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/x4u > > Seven Cent Deals - Great legacy stuff Great Legacy Pricehttp://www.drbott.com/prod/db.lasso?cat=Seven+Cent+Deal