Browse Prior Art Database

Magnetic Tape Testing Method

IP.com Disclosure Number: IPCOM000049228D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Fennema, N: AUTHOR [+3]

Abstract

A data integrity test is performed on magnetic tape dynamically during the initial and/or final stage of unwinding from a large supply roll onto a spool.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Magnetic Tape Testing Method

A data integrity test is performed on magnetic tape dynamically during the initial and/or final stage of unwinding from a large supply roll onto a spool.

Magnetic tape 1 (Fig. 1) is unwound from a large supply roll 2 and fed into a vacuum column 3 successively past a write head 4 and a read head 5 and then wound onto a spool 6. A data integrity test is conducted while a predetermined length of the tape is being wound onto spool 6. More specifically, data is written on the tape by write head 4, then read by read head 5, and the errors due to defects noted, in conventional fashion.

This test must be conducted at a constant speed L considerably lower than the speed W at which tape can be unwound from the supply roll and wound onto the cartridge spool. As shown in Fig. 2, this testing is performed for a time t during acceleration and/or deceleration of the tape to and/or from speed W. Time t can be adjusted, as desired, under computer control. In this manner, a small portion of the tape stored on each spool is tested, rather than testing periodically selected lengths of tape from the supply roll.

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]