Dynamic magnetic information storage or retrieval – General processing of a digital signal – Address coding
Patent
1974-10-21
1976-10-12
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Address coding
360 27, G11B 509
Patent
active
039862089
ABSTRACT:
A system of and method for writing and reading data on magnetic tape records having the capability of searching for certain data files in which selected messages are written is disclosed. The files are written successively on the tape with a name block which identifies or describes the files and data block which constitute the files written alternately to constitute the file format. The file names are written at much less than the normal data density. When reading the files, search operations are carried on at high tape speed; the ratio of the high tape speed to normal tape reading speed being the same ratio as the ratio of the normal density of recording of the data block to the lower density of recording of the file names in terms of bits per linear inch. The bit rate produced while reading the file names at high speed is then exactly equal to the bit rate generated while reading data blocks at low speed. Searches for selected files are conducted by comparing file names read from the tape with the names of the selected files while the tape is transported at high speed. Reading is carried out such that only data produced at the normal bit rate is read out and decoded. Thus, the tape speed selected is determinative of whether a search mode or data reading mode of operation is employed; special decoding logic or tracks for obtaining address data when tapes are driven in high speed search modes being eliminated.
REFERENCES:
patent: 3214736 (1965-10-01), Glaser
patent: 3654618 (1972-04-01), Kandz et al.
patent: 3727203 (1973-04-01), Crossman
patent: 3863265 (1975-01-01), Klumpp
Canney Vincent P.
Lukacher Martin
Sykes Datatronics, Inc.
LandOfFree
Data recording with high speed search capability does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Data recording with high speed search capability, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data recording with high speed search capability will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-947438