CrystalDiskMark Portable is designed to quickly test the performance of your hard drives. Currently, the program allows us to measure sequential and random read/write speeds. Crystal Disk Mark Portable puts up a decent performance and it serves its purpose very well. Features and Highlights Measure sequential reads/writes speed Measure random 512KB, 4KB, 4KB (Queue Depth=32) reads/writes speed Select test data (Random, 0Fill, 1Fill) Theme support Multi-Language support FAQ Why the result differ from other benchmark software? The result depends on Test File Size, Test File Position, Fragmentation, ID (PATA)/SATA/RAID/SCSI controller and CPU speed, etc. Failed benchmark test It may not enough privilege to create a test file. Please run Crystal Disk Mark Portable as administrative privileges. How to fix CrystalDiskMark’s UI bug If zip edition does not work fine, please check security: unblock option and extract zip file again. If you run FixUI. bat including a squat file, it may work fine. I would like you to use the installer edition or store edition. Download CrystalDiskMark Portable Latest Version