fio - Generate I/O for benchmarking, stress testing, verification or workload reproduction purposes.
CrystalMark - CrystalMark is a full included benchmark application that can be utilized for surveying the execution and capacities of a PC.
Iometer - As the Iometer Users Guide says, Iometer is an I/O subsystem measurement and characterization tool...
IOzone - IOzone is a filesystem benchmark tool.
Blackmagic Disk Speed Test - Blackmagic Disk Speed Test is a tool that allows users to quickly measure disk performance while working on it.
Disk Bench - I want to know how fast are my disks really are, in a real life situations.