Hello, I have 1TB Hard Drive on my iMac 26 inch running with mac 10.7.3, There is a message displayed frequently from the disc utility saying that Disc is full, Disc is running out of space, please delete few items. But all the data and docs in my disc uses only 300GB and the remaining is empty, but why this message is displayed all the time? When I checked the properties of my disc, the remaining free space is listed as 'other'. How to get rid of this message and free the space? Thank you.