Crystal Dew World

Crystal Dew World is a software development project that provides a suite of free, open-source system utility tools primarily designed for Microsoft Windows. The project is best known for its disk management and benchmarking applications, which are widely used by PC enthusiasts, system administrators, hardware reviewers, and general users who need to monitor or evaluate storage performance and health. The main products include CrystalDiskInfo (often abbreviated as CDI), CrystalDiskMark (CDM), CrystalMark Retro, and CrystalMark 3D25. Each tool serves a distinct purpose and is offered in multiple editions, including standard versions and variants named after characters such as Aoi and Shizuku. CrystalDiskInfo is a hard disk drive and solid-state drive health monitoring tool. It reads S.M.A.R.T. (Self-Monitoring, Analysis, and Reporting Technology) data from a drive and displays information including temperature, power-on hours, read/write error rates, reallocated sector counts, and other attributes that indicate the drive’s reliability. The software also provides an overall health status rating (good, caution, bad) and alerts users when critical values exceed thresholds. It supports various interfaces such as SATA, NVMe, USB, and RAID configurations. CrystalDiskInfo also features a graphical trend chart showing temperature or other attributes over time, and it can run in the background with a system tray icon that shows the current drive temperature and health color code. The “Aoi” and “Shizuku” editions add cosmetic changes with different themes or character mascots, but the core functionality remains identical. CrystalDiskMark is a microbenchmarking tool that measures the sequential and random read/write speeds of storage devices. Users can choose different test modes,