I have a Macbook pro 5,5 with the 250GB hard drive. I recently purchased the 1.5TB Toshiba 2.5" HDD. I used a HD duplicator machine to clone my entire drive onto the new 1.5TB drive (about 234 GB of data). When I installed the new 1.5 TB drive, everything booted up perfectly and appeared normal. However, when I opened finder, much to my dismay, I saw that I only had 16 GB remaining. When I go into to "About This Mac," it recognizes that I have the bigger HD installed, but it acts like I have the 250 GB hard drive installed. Below is what appears in the "about this mac" under my SATA tab: TOSHIBA MQ01ABC150: Capacity: 1.5 TB (1,500,301,910,016 bytes) Model: TOSHIBA MQ01ABC150 Revision: AQ001U Serial Number: 33CVTGG6T Native Command Queuing: Yes Queue Depth: 32 Removable Media: No Detachable Drive: No BSD Name: disk0 Rotational Rate: 5400 Medium Type: Rotational Partition Map Type: GPT (GUID Partition Table) S.M.A.R.T. status: Verified Volumes: Capacity: 209.7 MB (209,715,200 bytes) Writable: Yes BSD Name: disk0s1 Macintosh HD: Capacity: 249.72 GB (249,715,376,128 bytes) Available: 14.08 GB (14,076,669,952 bytes) Writable: Yes File System: Journaled HFS+ BSD Name: disk0s2 Mount Point: / Anyone have any ideas?