A 5-channel generator is developed to obtain the frequency response of a hard disk drive (HDD) by emulating the Bode-plot functions of a Dynamic Signal Analyser (DSA). Written in LabVIEW, it runs on the Windows 95 platform using a standard Wintel PC, a commercial data acquisition (DAQ) board and an external hardware anti-alias filter board. This generator achieves a superior advantage at lower cost through its ability to evaluate the track-following servo loop frequency response of up to five HDDs simultaneously. %in the frequency range from 50Hz to 5kHz. Besides reducing test-time and providing a degree of accuracy comparable to a commercial DSA, it also includes an option to save all acquired data to disk for further analysis with other software engineering packages.