Patent application number | Description | Published |
20090303633 | Same Wrap Backhitchless Write Method to Encode Data on a Tape Storage Medium - A method to write information to a tape storage medium by disposing a tape storage medium in a tape drive apparatus comprising a write head. The method moves the tape storage medium in a first direction, writes data from a buffer to the tape storage medium, and thereby empties the buffer while the tape storage medium is moving in the first direction. The method determines, while the tape storage medium is moving in the first direction, whether to enable a backhitchless write wherein the tape storage medium is not stopped and moved in a second and opposition direction, prior to writing new data to the tape storage medium. By not stopping the movement of the tape storage medium, and by not moving the tape storage medium in a reverse direction to reposition the write head, the method eliminates the time overhead required to stop the tape and reposition the tape head. Applicants' method achieves this time efficiency without adverse impact to the nominal storage capacity of the tape information medium. | 12-10-2009 |
20100007978 | DETECTION OF DEFECTIVE TAPE DRIVE BY AGGREGATING READ ERROR STATISTICS - A plurality of tape drives writes a plurality of indicators corresponding to a plurality of data units on a tape, wherein an indicator indicates which tape drive of the plurality of tape drives has written a corresponding data unit on the tape. Each of the plurality of tape drives generates an extent of read errors, in response to reading the plurality of data units written on the tape. The extent of read errors generated by each of the plurality of tape drives are aggregated at a computational device coupled to the plurality of tape drives. A determination is made at the computational device of a defective tape drive of the plurality of tape drives from the aggregated extent of read errors. | 01-14-2010 |
20100118430 | METHOD AND SYSTEM FOR IMPROVING DATA ACCESS TIME - A computer implemented method of writing data to a linear tape is provided and includes, of the data to be written to the linear tape, distinguishing between data and meta-information, writing both the distinguished meta-information and undistinguished meta-information to a data area of the linear tape and the distinguished meta-information to a reserved area at a leading end of the linear tape, and retaining information reflective of the meta-information and a location thereof in a specified position of the reserved area. | 05-13-2010 |
20100302667 | DETECTION OF DEFECTIVE TAPE DRIVE BY AGGREGATING READ ERROR STATISTICS - A plurality of tape drives writes a plurality of indicators corresponding to a plurality of data units on a tape, wherein an indicator indicates which tape drive of the plurality of tape drives has written a corresponding data unit on the tape. Each of the plurality of tape drives generates an extent of read errors, in response to reading the plurality of data units written on the tape. The extent of read errors generated by each of the plurality of tape drives are aggregated at a computational device coupled to the plurality of tape drives. A determination is made at the computational device of a defective tape drive of the plurality of tape drives from the aggregated extent of read errors. | 12-02-2010 |
20110222379 | METHOD FOR CONTROLLING OVERWRITING OF DATA BY TAPE RECORDING APPARATUS , PROGRAM FOR CONTROLLING OVERWRITING , AND TAPE RECORDING APPARATUS - A data-overwriting technique that facilitates determining whether data is new or old, when reading thereof. A tape recording apparatus includes: a receiving unit for receiving information on overwrite starting position and an overwrite request; a trying unit for trying to determine a beginning position of a data unit based on the information on an overwrite starting position, wherein the data unit is a unit of writing data recorded on a tape medium; an overwrite executing unit for executing overwriting from the determined overwrite starting position in response to a success of the determination by the trying unit; and a type judging unit for judging whether the data unit that is recorded at the overwrite starting position is a null data unit or not in response to a failure of the determination by the trying unit. The trying unit responds to judgment that the data unit is the null data unit by trying to determine a beginning of a data unit following the data unit as the overwrite starting position. | 09-15-2011 |
20120079185 | TAPE STORAGE SYSTEM INCLUDING MULTIPLE TAPE STORAGE APPARATUSES - A tape storage system according to one embodiment includes two or more tape storage apparatuses each having a buffer divided in fixed-length segments, and being connectable to a host, where a first of the tape storage apparatuses is configured to receive multiple data clusters and a synchronization request from a host, and, when one of the segments of the buffer is accumulated and filled with the data, to write the accumulated data onto a tape. A second of the tape storage apparatuses is connected to the first tape storage apparatus, the second tape storage apparatus being configured to receive the multiple data clusters sent from the host via the first tape storage apparatus, and being configured to write a predetermined number of data clusters accumulated in the segments thereof onto a second tape at a timing corresponding to the synchronization request. | 03-29-2012 |
20120212848 | OVERWRITE CONTROL METHOD FOR DATA IN TAPE RECORDING APPARATUS, AND TAPE RECORDING APPARATUS - A data-overwriting technique that facilitates determining whether data is new or old. A tape recording apparatus includes: a receiving unit for receiving information on overwrite starting position and an overwrite request; a trying unit for trying to determine a beginning position of a data unit; an overwrite executing unit for executing overwriting from the determined overwrite starting position in response to a success of the determination by the trying unit; and a type judging unit for judging whether the data unit that is recorded at the overwrite starting position is a null data unit or not in response to a failure of the determination by the trying unit. The trying unit responds to judgment that the data unit is the null data unit by determining a beginning of a data unit following the data unit as the overwrite starting position. | 08-23-2012 |