I am taking my iMac to a 3d party (but Apple approved) reseller to have the HDD replaced. It is failing, as seen in delays and as reported by Disc Utility.app. However is still functional and I would like to delete all personal information and passwords before handing it over to non Apple employees. Of course I will delete user generated files such as in Documents, Photos, Quicken etc. Also I plan to delete login.keychain and metadata.keychain library files. I can go into each browser that I use and clear the respective caches. My key questions are as follows: Can (or should) I clear the whole cache folder from root drive/library/caches and root/users/username/library/caches? Is there anything else that I should delete? I know that I could just clean format the drive before bringing it in but I thought it might be better if they could run it enough to take a look. I plan to ask them to format the new drive but not install the OS. I plan to boot and restore from a clone drive made by Carbon Copy Cloner.app. Any opinions or advice would be appreciated.