OK so it is small at 40GB, but if you follow Lloyd's Mac Performance Guide parameters for a backup/boot drive all should fit into this. Hey, since OWC makes about the best out there this is your chance to try an SSD with very little outlay which IMHO seems to be the biggest stumbling block to buying SSD's. I noticed it is an August sale. P.S.-Sure this does not give speed of access to data which should be kept separate from boot/applications, but if you're going to use a dual drive system this might work, forcing you to keep things lean and mean. Just the sounds for GarageBand take up about 2GB. As you can tell I do not use GarageBand. How about getting rid of 100 printer drivers for printers you do not own. And then there are foreign languages, etc., etc.