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Nowadays, the performance of computers has improved very fast. The design development of data storage devices such as Hard Disk Drive (HDD) has also improved in order to gain more capacity with less access time. Therefore, the higher spindle motor speed is needed. This requirement will then directly affect to the airflow inside the HDD, which is one of the major factors causing the vibration on the recording head whilst flying on the data track. The objective of this paper is to study on the airflow in 3.5-inch with 7200-rpm motor speed, single head HDD, one of the most common HDD models in the current market. Three-dimensional RNG K-epsilon Model will be used in this study by comparing the airflow of two different models: the former is the model with air latch and the latter is the model without air latch. The Head Gimbal Assembly (HGA) position at Outside Disk (OD) position and Inside Disk (ID) position are also studied. The simulation results with RNG K-epsilon Model showed that by repositioning the HGA, the airflow inside the HDD is also changed. The airflow inside the HDD across the arm and the HGA is significant faster when the HGA is positioned at OD. Therefore, the arm and the HGA at OD position will face the vibration problem higher than at the ID position. The air latch is found to reduce air velocity about 35%. The conclusions of this paper would be useful for further study on flow induce vibration on the HGA.

THE EFFECT OF AIR LATCH ON THE AIRFLOW IN 3.5-INCH HARD DISK DRIVE