Unlock instant, AI-driven research and patent intelligence for your innovation.

Tough detection to servo data modulated as time base

A data and time base technology, applied in digital signal error detection/correction, data recording, alignment of tracks on tape, etc., can solve problems such as not allowing error correction bytes, increasing LPOS word length, etc.

Inactive Publication Date: 2004-11-17
IBM CORP
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current standard for LPOS words does not allow error correction bytes
Doing so will likely unacceptably increase the LPOS word length

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Tough detection to servo data modulated as time base
  • Tough detection to servo data modulated as time base
  • Tough detection to servo data modulated as time base

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] The present invention is described in terms of preferred embodiments in the following description with reference to the accompanying drawings in which like reference numerals represent like or similar elements. While the invention has been described in terms of the best mode for carrying out the purposes of the invention, those skilled in the art will recognize that changes may be made in light of these principles without departing from the spirit or scope of the invention.

[0026]Referring to Figures 1 and 2, there is shown a data storage system comprising a tape drive data storage device 12, such as a magnetic tape drive, and an associated tape cartridge 14 having a data detector 15 according to the present invention. Referring to FIG. 1 , tape drive 12 receives tape cartridge 14 , which stores data in the form of data sets to be read and / or written by tape drive 12 , and is connected to host processor 16 by cable 18 . Cassette 14 includes a housing 19 containing a l...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A detector and method for detecting data modulated into a timing based servo pattern prerecorded on a media, comprising shifts of pairs of non-parallel transition stripes arranged in a frame of two bursts. Timing intervals between sequential transition stripes are detected. Interval comparison logic compares selected timing intervals and indicates whether the compared intervals represent a '0', or a '1'. First and second counters respectively increment the number of the compared intervals representing a '0' and representing a '1' in each frame. As a result, a correct word is provided at the output terminal even if a invalid one is detected.

Description

technical field [0001] This invention relates to time-based servo systems for longitudinal recording, and more particularly to the detection of errors in pre-recorded data modulated into a time-based servo pattern on a medium. Background technique [0002] Commonly assigned US Patent No. (Serial No. 08 / 859830) to Albrecht et al. is included because it describes a magnetic tape medium having data information superimposed on pre-recorded track following servo information. [0003] Typically, longitudinal media such as magnetic or optical tapes are used as secondary storage media for storing large amounts of data (eg, archives) that are accessed sequentially or infrequently. To accommodate large amounts of data, the tracks are placed close together and a track-following servo system is employed to allow the heads to accurately track the data tracks. [0004] An example of a track following servo system particularly suitable for magnetic tape including a time-based servo patter...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G11B27/10G11B5/584G11B5/592G11B20/18
CPCG11B5/592G11B5/584G11B15/03G11B15/087G11B2220/90
Inventor 南武威福田纯一格兰·阿兰·家奎特约翰·亚历山大·科斯基鹤田和弘
Owner IBM CORP