In this paper, a discrete-time frequency-shaped sliding mode control (FSSMC) is proposed for audio-vibration rejection in Hard Disk Drives (HDDs). Such vibrations cause significant degradation of the servo performance and have become a major concern in the HDD industry The proposed FSSMC involves the frequency-shaped sliding surface design based on peak filters, aiming to provide frequency dependent control allocation in sliding mode control (SMC). Compared to standard SMC, FSSMC provides additional design flexibilities in the frequency domain, and improves vibration rejection during track-following in HDDs. Those benefits are validated by simulation based on benchmark models and actual vibration data.