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For hard disk drives (HDDs) having multiple disk rotational speeds, a new data channel and head positioning servo system was developed. Head positioning performance at the low spin-speed was preserved by using a synchronous servo scheme with more servo areas than the conventional scheme. Using a common physical disk format, sufficient servo performance and the same data recording density of 1.3 Gbit/inch/sup 2/ were obtained on two 2.5 inch prototype HDDs with a low spin-speed of 37.5 Hz and a high spin-speed of 75 Hz. Disk interchangeability was also confirmed.

A track density simulation model for a discrete track medium and an MR/Inductive head was developed based on an iterative geometric signal-to-noise ratio calculation. Using this model, we optimized design parameters of discrete track media related to track density. Our model suggests that discrete track media can achieve higher track density than conventional continuous track media.