Minimizing high resolution tape directory recovery time

GB2644408APending Publication Date: 2026-04-08INTERNATIONAL BUSINESS MACHINE CORPORATION
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Patent Information

Application Number
GB2026000310
Authority / Receiving Office
GB · GB
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-06-18
Filing Date
2024-05-07
Publication Date
2026-04-08

AI Technical Summary

Technical Problem

High Resolution Tape Directory (HRTD) recovery time is inefficient in magnetic tape data storage systems, particularly when the HRTD is invalid upon loading, leading to time loss and reduced tape drive efficiency.

Method used

The system and method involve loading a tape and determining if the HRTD is valid upon receiving a write or read command. If invalid, the tape drive clears a timer and optionally repositions to the End of Data (EOD) position to read and validate the HRTD, allowing for automatic recovery before executing commands, with a statistically calculated 10-second time limit for recovery.

Benefits of technology

This approach reduces time loss associated with HRTD recovery by enabling automatic validation and recovery, improving tape drive efficiency and minimizing navigation time to the target location.

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Abstract

Provided is a system, method, and computer program product for minimizing high resolution tape directory (HRTD) recovery time when a HRTD is invalid. A tape drive may load a tape in the tape drive. In response to receiving a write command or a read command at a beginning of tape (BOT) position, the tape drive may execute the write command or the read command without performing HRTD recovery. In response to receiving the write command or the read command at a position other than the BOT position, the tape drive may determine if the HRTD is valid. In response to determining the HRTD is not valid, the tape drive may clear a timer.
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