[n: Driving Of Both Record Carrier And Head (g9b/15.055 Takes Precedence; Mounting Of Head G9b/5.173)] {g11b 15/18b} Patents (Class G9B/15.022)

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[n: programmed access in sequence to indexed parts of operating tapes cooperating with rotating heads (see provisional also g9b/15.001)] {g11b 15/18b1} (Class G9B/15.023)

[n: driving or moving the head in a direction which cuts across the direction of travel of the tape, e.g. for helicoidal scanning] {g11b 15/18b2} (Class G9B/15.024)

[N: with head driven in a plane, cyclically around an axis, e.g. on headwheel (construction of headwheel G9B/5.174, G9B/21.023; disposition of heads on headwheel G9B/5.175, G9B/21.003)] {G11B 15/18B2R} (Class G9B/15.025)

[N: with provision for information tracking by moving the transducing part of the head relative to the headwheel, in the direction of the scanning movement, e.g. for skew or time base correction (in the direction which cuts across tracks, i.e. for track following G9B/3.073, G9B/5.204, G9B/7.042, G9B/21.012, G9B/21.018; by controlling headwheel rotation G9B/15.066, by guiding the tape G9B/15.077)] {G11B 15/18B2R2} (Class G9B/15.026)

[N: using signals recorded in tracks disposed in parallel with the scanning direction] {G11B 15/18B2R2S} (Class G9B/15.027)

[N: using auxiliary signals, i.e. pilot signals] {G11B 15/18B2R2S2} (Class G9B/15.028)

[N: superimposed on the main signal track] {G11B 15/18B2R2S2M} (Class G9B/15.029)

[n: adaptations for special effects or editing (signal processing or indexing therefor g9b/27)] {g11b 15/18b3} (Class G9B/15.03)

DATA STORAGE APPARATUS

Publication number: 20090244756

Abstract: A data storage apparatus includes: a medium for storing data having synchronization marks and data blocks, the synchronization mark and the data block being allocated alternately in the circumference direction of the medium; a head writing data into or reading out data from the medium; and a processor for executing a process including: reading out synchronization marks, measuring time for the head to pass through each of the data blocks based on signals read out from each of the synchronization marks in the circumference direction, generating write/read clock for each of the data blocks, which is continuously changing in speed, by calculating difference in time for the head to pass through the each one of the data blocks and its adjacent one of the blocks on the basis of the time measured, and writing data into or reading out data from the medium in synchronization with the write/read clock.

Type: Application

Filed: March 24, 2009

Publication date: October 1, 2009

Applicant: FUJITSU LIMITED

Inventors: Akihiro Itakura, Toshikazu Kanaoka

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DATA STORAGE APPARATUS