I've started putting up disk and controller test data in this forum, as it relates to the StableBit Scanner's ability to gather SMART and Identify data using various disk controllers.   Direct I/O Test   "Direct I/O" is a set of technologies that the StableBit Scanner uses to read data directly from the disk. I collect my test results using an internal Direct I/O testing tool.     You can get the latest version here: Download   The tool will probe your disk and controller for various