International Business Machines Corporation

Toshimi Ataku

Toshiyuki Shiratori

Glen Alan Jaquette

Hiroshi Itagaki

Paul Merrill Greco

Tomoaki Kimura

Hironobu Nagura

A method of adjusting a magnetic head of the invention includes the steps of: setting a cleaning cartridge into a drive unit; identifying the set cartridge as the cleaning cartridge by checking a cleaning bit in a non-volatile memory; performing an adjustment-operation after a cleaning operation when the set cartridge is identified as the cleaning cartridge; and reading out a pattern signal from a predetermined segment of the magnetic tape held in the cleaning cartridge.

Method and system for adjusting a magnetic tape head

Special fields for error recovery are provided in data set information tables of data sets written with synchronized transactions. If a transaction only partially fills a data set, that data set is rewritten in a succeeding data set, appending the next transaction. A moving access point in the table identifies the appended transaction, allowing the rewritten transaction to be skipped during read recovery. The table provides recovery trails by providing a thread to tie the data sets together, the status of the data set, and pointers, such as identifying the wrap of the immediately succeeding data set.

Data set information for recovery of synchronized data on magnetic tape

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Kanagawa-ken, Japan

Toshimi Ataku