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| Method for transferring documents |
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| System for issuing resident certificates |
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| Authentication using random challenges |
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| Device and method for authenticating user's access rights to resources |
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| Information processing system, electronic device and control method |
| Accordingly, an object of the present invention is to provide an information processing system, as ... |
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| Connector system for coaxial cables |
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| Removable data storage drive security module with lockable write protect feature |
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| Multimedia interface device and method |
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Data recording system having unique end-of-recording and start-of-recording format indicators
| Details |
Inventors: Shih, Lionel C.; Wood, Tracy G.;
Assignee: Ampex Corporation (Redwood City, CA)
Primary Examiner: Hajec; Donald
Assistant Examiner: Forbus, Jr.; T. N.
Attorney, Agent or Firm: Mesaros; John G., Barbas; Charles J.
A helical type tape recording and reproducing system records blocks of user data of predetermined size by reformatting the user data blocks into physical blocks that are recorded on tape, with the physical blocks being recorded as double frames. Each double frame is recorded on a set of successive helical tracks, preferably 32 tracks. Each double frame has system format data interleaved with the user data block data which identifies the double frame as being of a particular type. The present invention is directed to the types of double frames that are used to begin a recording, particularly an append recording which involves recording by the system at a previously recorded tape which may have been recorded by a different system, as well as the types of double frame that are used to end a recording. |
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DETAILED DESCRIPTION OF THE INVENTION Broad Overview of the System While the present invention will be specifically described in connection with a rotary head helical scan tape recording apparatus, it is equally applicable to other types of recording apparatus, such as a disk recorder or a longitudinal or quadruples-type tape recorder.
Additionally, while the present invention will be described in conjunction with the recording and reproducing of information on magnetic tape with the use of electromagnetic transducing heads, the present invention is also applicable to optical recorders or the like using appropriate transducers and recording mediums.
It should also be understood that the present invention is applicable to arrangements where the rotating record and/or reproduce head can move in either rotational direction, where the tape can be introduced to the helical path either above or below the exit point from the path and where the tape can be transported about the helical path in either direction.
The system or apparatus disclosed herein can also be referred to as a data storage peripheral that is a high speed, high density helical scan tape recording and reproducing device that is designed to be operated in a master/slave environment as defined by the Intelligent Peripheral Interface (IPI) standards, such as ANSI X3.
147-1988 (ANSI is the American National Standard Institute) and ANSI X3T9/88-82, Revision 2.
1, Jan.
3, 1989.
The system provides the functionality of an IPI-3 slave, as illustrated in FIG.
1.
The system, indicated generally at 20, is an addressable entity under control of and is connected to an IPI master 22 that is resident in a host system 24.
The host system IPI master 22, which is not described herein, is responsible for managing the system 20 as well as other IPI slaves in accordance with the capabilities thereof and is responsible for controlling the IPI interface.
Referring to the broad functional block diagram of FIG.
2, the system 20 has the capability to accept commands and data from and transfer responses and data to the host system 24 (FIG
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I/O Systems 
