Embedded Servo Sectors on Magnetic Tape Data Tracks
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Solution Overview
Problem
Conventional tape drive storage systems face challenges in accurately positioning heads relative to magnetic tape and compensating for tape stretch, leading to inefficiencies in data access and storage due to limitations in servo sector recording and head positioning methods.
Innovation Solution
The implementation of a data storage device with a head bar comprising multiple heads that read servo sectors across the width of the tape, generating position error signals to position the heads accurately and adjust for tape stretch by tilting and tensioning the head bar, while using external servo writers to record servo sectors at various angles and employing perpendicular magnetic recording for precise servo sector detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional servo sector recording methods are used, then the system structure remains simple, but head positioning accuracy deteriorates and tape stretch compensation is insufficient
Solution Approach 1:
The patent divides the tape width into multiple track regions, each with dedicated servo sectors. Multiple heads are assigned to read servo sectors from different tracks simultaneously, enabling parallel position error signal generation and improved positioning accuracy without requiring a single complex servo system
Solution Approach 2:
The patent uses data tracks to carry both user data and servo information. The same magnetic tape medium serves dual purposes: storing user data in data segments and providing positioning reference through embedded servo sectors within the same track structure, eliminating the need for separate dedicated servo tracks
2Productivity
If multiple heads read servo sectors concurrently, then head positioning accuracy improves, but the complexity of managing multiple heads and their positioning increases
Solution Approach 1:
The patent positions servo sectors at periodic intervals along the tape length and uses the periodic nature of tape motion to synchronize head positioning. The periodic repetition of servo sectors allows heads to continuously generate position error signals at regular intervals, maintaining accurate positioning throughout data access operations
Solution Approach 2:
The patent enables each head to independently read its assigned servo sectors and generate its own position error signals without requiring complex centralized control. The head bar assembly automatically maintains positioning through the collective self-correction of multiple heads reading from their respective servo sectors
3Measurement precision
If servo sectors are written at angles relative to tape motion, then head positioning accuracy improves, but the manufacturing complexity of the writing system increases
Solution Approach 1:
The patent writes servo sectors at diagonal angles relative to the tape motion direction rather than perpendicular to it. This angular configuration creates a geometric pattern that provides more robust position error signals for head positioning, as the angled servo tracks intersect data tracks at optimal angles for detection while compensating for tape stretch effects
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances data access accuracy and storage efficiency by improving head positioning and compensating for tape stretch, allowing for concurrent access operations and increased storage capacity with reduced noise and error, thereby optimizing tape drive performance.
Implementation Method 1
at least one head configured to access a magnetic tape... the head is used to read one of the servo sectors to generate a first read signal
Implementation Method 2
The head is used to read one of the data segments to generate a second read signal, and the second read signal is processed to detect user data recorded in the data segment
Implementation Method 3
magnetic tape comprising a plurality of data tracks... each data track comprises a plurality of data segments and a plurality of servo sectors
Data Source
AI summary
An external servo writer configured to write a plurality of embedded servo sectors on a magnetic tape to define a plurality of data tracks is disclosed. A first part of the plurality of embedded servo sectors is written while controlling an actuator to first move a head vertically along a width of the magnetic tape. A second part of the plurality of embedded servo sectors is written while controlling the actuator to second move the head vertically along the width of the magnetic tape.