Dedicated Servo Recording System and Performance Evaluation


The perpendicular magnetic recording (PMR) in arduous disk drives is approaching its physical limitation. The emerging technologies, such as heat assisted magnetic recording and microwave assisted magnetic recording are proposed to record on magnetic media with thermally stable smaller size grains at higher areal density (AD). But, in the media fabrication, achieving well-isolated small size of grains is more challenging than getting high $K_u$ material as recording media. Reducing the number of grains per bit could be a major path for keeping AD growth of PMR lately. To minimize the SNR penalty at a smaller grain variety per bit, pushing additional on course density is the proper approach. With the 2-D magnetic recording (TDMR) readers for inter-track interference cancellation, the off-track browse capability is improved significantly for permitting a narrower track read. Within the drive working setting, when the external vibration or other mechanical disturbance happens during the writing process, it creates a lot of track squeeze at adjacent tracks and leaves a terribly slender track at some locations of the track. When the track width is narrower than the squeeze to death width in the 747 curve, it causes arduous failure in the channel. To solve the track squeeze downside, this paper proposes to add an extra magnetic recording layer in between the information recording layer and also the soft underlayer of standard PMR media. This further recording layer is used to record servo data solely. The continuous positioning error signal is ready to improve the servo performance and to produce the important-time monitoring of the positioning error. When it is underneath bad servo conditions, the writing method will be stopped to avoid nontolerable track squeeze. The continuous servo signals are designed to be of moderate intensity at very low frequency, and its impact on information signal has been minimized. The linea- density gap between the dedicated servo media and the conventional PMR media is in a position to be controlled inside 3%. Because the dedicated servo system keeps solely around one hundred wedges of track ID and sector ID at the information layer, the surface area saving at the info layer will break even in capability. The dedicated servo technology along with TDMR readers is that the key technology to attain ultrahigh track density throughout both writing and reading processes.

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