I bought a Kingston 120 GB SSD for my 2011 MBP. The original HDD is now where the superdrive used to be, and the SSD is in its place. The new drive is formattable, and read/writable (seemingly), but I'm having a number of really strange issues. 1. I booted to the old drive and formatted the new drive using Disk Utility: 1 partition, GUID partition table, Mac OS Extended (Journaled) file structure. This works fine and files can be copied to & deleted from the drive. 2. I booted into recovery mode using CMD+R and tried to download/install a fresh OS X Yosemite to the drive. After an hour or so the bar is full, and then perhaps another hour goes by before it says "Failed to download OS X. Please use the purchases page". 3. I boot back into the old drive, go into the app store, and download the OS X installer. I run it, specify the drive, boot to it, and continue the installation. After a while I get an error that the copy failed. 4. I tried using Disk Utility's restore function to clone my OS X partition (97 GB used) to the new drive and/or a new partition. Whether I do it from within OS X, or from recovery mode, I either get "error- 7", "invalid argument", or "failed to unmount drive". Another fresh format did nothing to change these things. 5. I tried the Carbon Copy Cloner program, which copied about 800 MB of data before hitting a write error. I removed the file that caused the error from both drives and tried again, but it's been sitting at zero progress for half an hour now. 6. Disk Utility verifies that the disk appears to be OK in all regards After all of this, I can only imagine the SSD must be defective. I've spent many hours trying every combination of things I can think of, and I'm getting super bummed out because the drive was a birthday present. What do you think? Is there something I'm missing, or perhaps something I should try? Is there a way I can check if the disk really is defective? Any insight is helpful!