Abstract:
PROBLEM TO BE SOLVED: To perform high-speed access after insertion of a cartridge and to easily protect the data of a tape position in the ejection of a cartridge. SOLUTION: A tape is divided equally between the logical head and the end, and an ejection position candidate ID is set. When a candidate ID is found in a record of user data UD1, retry processing is performed even when no error exists in the nest data UD2. The same data UD2 is recorded repeatedly by the number of times a region having possibility of being damaged is included in the ejection/insertion of a cartridge, and an ejection region is created. The ID of the position is stored in a memory making the approximate center of the ejection region as the ejection/insertion position. The next user data UD3 is recorded succeeding to the ejection region. In the ejection of a cartridge, a tape is moved to the ejection/insertion position ID. Since the ejection region is created by retry processing, the ejection region is easily created and since the same user data are repeatedly recorded in the ejection region, data is protected from damage.
Abstract:
PROBLEM TO BE SOLVED: To realize an inexpensive storage management system adaptable even to the increase of data quantity during an operation without any increase of a backup time. SOLUTION: This file management device for virtually managing a storage system constituted by combining a plurality of types of storage media whose physical characteristics are different as a single storage is provided with: a hierarchy management part (a) for performing the unitary management of the storage region of each storage medium configuring the storage system by logical hierarchy division for each project; and a movement managing part (b) for moving a project file from the high order division to low order division of the hierarchy division according to movement conditions predetermined for each project. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To shorten time needed for retry processing more than in the conventional manner by applying, for instance, a tape streamer for performing backup of the data of a server, etc., about a data processor, a data recording method and a data reproducing method. SOLUTION: Data for prescribed blocks are stored in a memory by combining reproduced data in which data whose error is hard to be corrected are detected with repeatedly reproduced data so as not to include the data whose error is hard to be corrected.
Abstract:
PROBLEM TO BE SOLVED: To enable a user to access a desired file in a shorter time than heretofore, when a magnetic recording and reproducing device and a pad spot detecting method are applied to a tape streamer to back up the data of, for example, a server, etc. SOLUTION: A magnetic tape 10 is unloaded in an unloading region of nearly an intermediate position of an area recorded with user data for the unloading regions ARU0, ARU1, ARU2, etc., set with prescribed intervals in the longitudinal direction of the magnetic tape 10 or the magnetic tape is unloaded by changing over the regions between the unloading region, corresponding to the position instructed by a host device and the unloading region in such intermediate position.
Abstract:
PROBLEM TO BE SOLVED: To mutually transfer blocks having different size through SCSI(small computer system interface) while saving block information. SOLUTION: Data contain the length of a 1st block and then 1st block data from the head. When is the data does not reaches the prescribed size, zero passing is performed. Further, the length of a 2nd block is stored and then 2nd block data are stored. When N blocks are transferred, blocks up to an (N)th block are stored similarly and repeatedly. The total number N of the blocks transferred this time is stored after the (N)th block data. Thus, the blocks having variable size are transferred successively while the block information is stored.