Abstract
To meet the areal density growth (∼60% compound annual growth rate) challenge in the disk drive industry, track density (tracks per inch, TPI) has been increasing at ∼30% rate. As the track density increases, the size of the erase band, unless controlled, becomes a significant portion of the written track. In this work, special equipment was developed to study (i) the size of erase bands, (ii) the effect of pole trimming on erase band and hooks, (iii) the effect of disk anisotropy on erase bands and hooks, and (iv) the effect of hooks and erase bands at high TPI. We demonstrated servo pattern writing and reading capability (through the drive preamp and channel) on a spin stand level, showing that for properly trimmed pole heads, hook and erase band size becomes insignificant. With untrimmed pole heads, isotropic disks showed smaller hooks compared to oriented disks. From this work, we concluded that at higher TPI, erase bands must be scaled so that the servo Gray code signal-to-noise ratio is not unduly degraded.
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