X-bit Labs has published a comparison of eleven 2.5" HDDs with capacities of 500GB, 640GB and 750GB. You can check out the report over here.
It is little less than a year since our last review of 2.5-inch hard disk drives and this is through no fault of ours. The manufacturers have been just too tardy transitioning to 320-gigabyte platters that enable dual-platter drives with a storage capacity of 640 gigabytes. Anyway, 2.5-inch HDDs have finally made it to that mark and there have also appeared 500GB models with a spindle rotation speed of 7200 RPM..