I'm looking for a bit of help, and hopefully confirmation that I'm taking appropriate steps to replace the existing HDD in my early 2009 iMac (3.06 GHz, 1TB HDD, EMC 2267). For the last few months the computer has been getting pretty slow and just recently has become nearly unusable. It takes longer than 10 minutes to start and clicking anything on the screen with get a spinning wheel for several minutes. I upgraded the RAM to 8GB and haven't seen any improvements. From what I've been reading, it sounds like it could be a HDD failure. I've tried doing some disk repairs (via single user mode) and haven't seen any improvements. I have a connected Time Machine external drive, but it looks like it hasn't been updated for a few months (not sure why). I also use CrashPlan for an off-site back-up (appears to be up to date). My next steps, based on reviewing this forum and some other sites, will be to replace the HDD and optical drive with a new 3TB HDD and 1TB SSD, respectively. It seems like a bit of overkill, but I have a nearly 500GB Aperture library and somewhat smaller sized iTunes media library. the existing HDD has only about 50GB of space. My plan was to isntall the OS and apps on the SSD and keep the photos and media on the HDD. I've purchased the following from Amazon: Samsung Electronics 840 EVO-Series 1TB 2.5-Inch SATA III Single Unit Version Internal Solid State Drive MZ-7TE1T0BW Western Digital 3 TB SATA III 7200 RPM 64 MB Cache Bulk/OEM Desktop Hard Drive, Black, WD3003FZEX Silverstone Tek 12.7mm Height 2.5-Inch SATA HDD/SSD Caddy Conversion Tray for Laptop (TS09) Rosewill Aluminum 3.5-Inch Silver USB 2.0 External Enclosure Cooling RX35-AT-SU SLV Silver Using these instructions from ifixit, I'll remove the existing HDD and replace it with the WD 3TB HDD. I'll also remove the optical drive and replace it with the conversion tray and the Samsung SSD. I realize that the iMac is a SATA II and the connection has a negotiated speed of 1.5, but I'm not too concerned about that. I would like to do a clean boot of Mavericks from a USB drive I created via these instructions from a macbook air that I purchased last summer. I'm not confident that this will work since it's from a different machine. I also have the original install disk from the iMac, if necessary. As far as setting up the new HDD and SSD, I've also seen a few reports of folks setting up a Fusion drive, with this post being the most helpful. It seems like an interesting concept, but I'm not sure I have the skills to deal with it if there are any issues. I'm hoping to connect to the old HDD with the Rosewill enclosure to retrieve the photo and media libraries and other files. I'd appreciate any feedback or words of caution. I've been using Apple devices for a number of years, but haven't tried anything like this before. Thanks!