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Method Of Assigning Separate Physical End Of Tape (PEOT) Points On A Tape Device For Read Forward And Write Commands

IP.com Disclosure Number: IPCOM000052084D
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11

Publishing Venue

IBM

Related People

Authors:
Kirkpatrick, CR Meier, RE Robinson, FL [+details]

Abstract

The position of the tape on a tape drive is known to the microcode by counting tachometer (T2) pulses from a 500-line tachometer on the file reel, between each tachometer (T1) pulse from a single line tachometer on the machine reel. This count represents a radius on the file reel, since the tape on the file reel is manufactured to a radius tolerance.