MHDD - MHDD is the most popular freeware program for low-level HDD diagnostics.
fio - Generate I/O for benchmarking, stress testing, verification or workload reproduction purposes.
Hard Disk Sentinel - Monitoring hard disk health and temperature. Test and repair HDD problems and predict failures.
CrystalMark - CrystalMark is a full included benchmark application that can be utilized for surveying the execution and capacities of a PC.
CrystalDiskInfo - CrystalDiskInfo. A HDD/SSD utility software which supports a part of USB connection and Intel RAID. >> Download. Intel RAID (IRST). IRST 11.
Iometer - As the Iometer Users Guide says, Iometer is an I/O subsystem measurement and characterization tool...