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1. 发明专利

DE3751744T2 未知
公开(公告)号：DE3751744T2
公开(公告)日：1997-01-02
申请号：DE3751744
申请日：1987-04-09
申请人： HITACHI LTD
发明人： MIYAZAWA SHOUICHI HITACHI-HACH , KAWAMURA SATOSHI , TOHYAMA SHOUICHIRO , ISHIBASHI AKIRA , KATO KAZUTOSHI , IKEDA JUNICHI
IPC分类号： G11B5/55 , G11B5/596
摘要： A disk drive system comprises a magnetic disk apparatus which accurately positions read/write means for reading data from and writing data on tracks on the data surface of a rotary disk on a predetermined track on the disk on the basis of servo data written in the servo area formed on the data surface, and a disk controller which controls the mode of operation of the disk apparatus. Index signals respectively indicating the start and end of the servo area are generated on the basis of the result of detection of the angular phase of the disk. The mode of operation of the magnetic disk apparatus is discriminated on the basis of a write control signal provided by the disk controller. The index signals respectively indicating the start and end of the servo area are sent to the disk controller when the mode of operation is track format write mode, while the index signal indicating the end of the servo area is sent to the disk controller when the mode of operation is other than the track format write mode.

2. 发明专利

DE3751744D1 未知
公开(公告)号：DE3751744D1
公开(公告)日：1996-04-25
申请号：DE3751744
申请日：1987-04-09
申请人： HITACHI LTD
发明人： MIYAZAWA SHOUICHI HITACHI-HACH , KAWAMURA SATOSHI , TOHYAMA SHOUICHIRO , ISHIBASHI AKIRA , KATO KAZUTOSHI , IKEDA JUNICHI
IPC分类号： G11B5/55 , G11B5/596
摘要： A disk drive system comprises a magnetic disk apparatus which accurately positions read/write means for reading data from and writing data on tracks on the data surface of a rotary disk on a predetermined track on the disk on the basis of servo data written in the servo area formed on the data surface, and a disk controller which controls the mode of operation of the disk apparatus. Index signals respectively indicating the start and end of the servo area are generated on the basis of the result of detection of the angular phase of the disk. The mode of operation of the magnetic disk apparatus is discriminated on the basis of a write control signal provided by the disk controller. The index signals respectively indicating the start and end of the servo area are sent to the disk controller when the mode of operation is track format write mode, while the index signal indicating the end of the servo area is sent to the disk controller when the mode of operation is other than the track format write mode.

3. 发明专利

JP2002230940A DVD-RAM BACKUP SERVER, SYSTEM, AND PROGRAM 失效
公开(公告)号：JP2002230940A
公开(公告)日：2002-08-16
申请号：JP2001022829
申请日：2001-01-31
申请人： HITACHI LTD
发明人： SOEDA KAZUHIRO , KOBAYASHI YUICHI , KATO KAZUTOSHI
IPC分类号： G06F12/00 , G11B27/00
摘要： PROBLEM TO BE SOLVED: To enhance the access performance to backup data stored in a DVD- RAM medium by shortening the time for referring to the backed up data stored in the DVD-RAM medium. SOLUTION: In a backup operation from the backup server 101 to a DVD library 105, a backup utility 103 reads data for backup designated by a user from a HDD104, and writes the read data in the DVD-RAM media 106 to 110 of a DVD library 105 designated as a backup destination. DVD-RAM management information is stored at the top of the DVD-RAM medium #1 (106), and backup data are stored behind that data. Although catalog information for discriminating what kind of backup data are stored into the individual DVD- RAM media 106 to 110 is usually stored in the tail end of backup data, this information is stored into the DVD-RAM management information region in this case to shorten the access time to backup data.

4. 发明专利

JPH06267616A DATA PROCESSING SYSTEM HAVING TERMINATOR 失效
公开(公告)号：JPH06267616A
公开(公告)日：1994-09-22
申请号：JP5551893
申请日：1993-03-16
申请人： HITACHI LTD
发明人： OKAZAKI TOSHIHIDE , SUGA MASAYUKI , KATO KAZUTOSHI , YOSHIMURA YOSHIHIRO
IPC分类号： H01R13/66
摘要： PURPOSE:To prevent the generation of temperature rise in a data processing device due to the heat generation of a terminator, and to downsize a device, and to realize the densification in a data processing device using a transmission line, which requires a terminator. CONSTITUTION:A terminator 5 is built in a connector 1a of a transmission line 1. Furthermore, the terminator 5 has the connecting/disconnecting function to facilitate the connection and the disconnection thereof. Generation of the temperature rise inside of a data processing device is thereby restricted and a mounting space is saved by building a terminator inside of a connector of a cable as a transmission line.

5. 发明专利

JPH0235262B2 失效
公开(公告)号：JPH0235262B2
公开(公告)日：1990-08-09
申请号：JP16761783
申请日：1983-09-13
申请人： HITACHI LTD
发明人： SUGIURA YASUYUKI , MORINAGA SHIGEKI , ENDO TSUNEHIRO , TAJIMA FUMIO , MYASHITA KUNIO , KATO KAZUTOSHI , MURAMATSU MASAHARU
IPC分类号： G05D13/62 , G01P3/489 , H02P29/00

6. 发明专利

JPS63251978A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS63251978A
公开(公告)日：1988-10-19
申请号：JP8569787
申请日：1987-04-09
申请人： HITACHI LTD
发明人： KATO KAZUTOSHI , ISHIBASHI AKIRA
IPC分类号： G11B21/10
摘要： PURPOSE:To properly position a head even if servo data are destructed, by providing a means which switches a head to another head whose servo data are not destructed when the servo data of the first mentioned head are destructed. CONSTITUTION:Servo data for positioning the center of data tracks are previously stored in the main body of a magnetic disk 1 and, at the same time, servo data of a position which becomes a reference position are previously used for positioning. It is made possible to use the servo data of another position as a reference when the servo data of the position which becomes the reference position are destructed. In other words, servo data are fetched by means of an MPU 11 through an amplifier 7A A/D converter 13 and whether they are destructed or not is discriminated. When the servo data are destructed, a new servo head is designated and this designation is sent to a switching circuit 14 so as to make switching of head amplifier 6. Therefore, positioning of a head 2 can be controlled even if part of servo data disappears.

7. 发明专利

JPS63100681A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS63100681A
公开(公告)日：1988-05-02
申请号：JP24521986
申请日：1986-10-17
申请人： HITACHI LTD
发明人： ICHIKAWA MASATOSHI , KATO KAZUTOSHI , KAWAMURA TETSUSHI , MIYAZAWA SHOICHI , SHIMADA YUJI
IPC分类号： G11B21/10
摘要： PURPOSE:To shorten a seek time and to improve positioning accuracy by providing data buffers storing position correcting amounts and outputting a seek complete signal after the amount is confirmed. CONSTITUTION:A disk 2 is divided into plural blocks through the inner-most cylinder to the outer-most cylinder. Each block is provided with the position correction data buffers 5 and 6 storing the correcting amounts by which the position of a head 1 is corrected. The buffer 5 stores data estimated according to a change in its contents, while the buffer 6 stores data updated at every time the position is corrected in the block concerned. At the time of seek, the head is seeked in the position with a little off-track amount from a specified cylinder with the aid of the buffer 5. Upon the completion of seek, the position of the head is corrected based on the difference between the contents of the buffers 5 and 6 in the block concerned, and the seek complete signal is outputted. Thus the seek time is shortened, thereby improving the positioning accuracy.

8. 发明专利

JPS63858A MAGNETIC DISK DEVICE 失效
公开(公告)号：JPS63858A
公开(公告)日：1988-01-05
申请号：JP14301586
申请日：1986-06-20
申请人： HITACHI LTD
发明人： MIYAZAWA SHOICHI , KAWAMURA TETSUSHI , KATO KAZUTOSHI
IPC分类号： G11B21/10 , G11B19/04
摘要： PURPOSE:To improve reliability, by providing a circuit to detect abnormal write in a servo area, outputting a bit of abnormality information to a disk controller, and protecting a bit of servo information by invalidating a write gate signal. CONSTITUTION:A write abnormality detection circuit 18 samples a write gate signal WGS from a disk controller 16 at the front edge of the pulse of a signal C, by using signals B and C from a delay circuit 12. If a write operation is continued until the pulse of the signal C becomes active, the circuit 18 judges the write as abnormal write, and invalidates the signal WGS from the controller 16 by the output, thereby protects the bit of servo information. Furthermore, the output is sent to the controller 16, or a host 17 as a write fault signal WFS, thereby, an abnormal write operation can be stopped. In such a way, it is possible to perform protection for overwrite, and to improve the reliability.

9. 发明专利

JPS6245152A EP-ROM 失效
公开(公告)号：JPS6245152A
公开(公告)日：1987-02-27
申请号：JP18416285
申请日：1985-08-23
申请人： HITACHI LTD
发明人： KATO KAZUTOSHI , SATO MASAHIKO
IPC分类号： G11C17/00 , G11C16/02 , G11C16/18 , H01L21/8247 , H01L23/02 , H01L29/788 , H01L29/792
摘要： PURPOSE:To protect recorded data from being erased by a method wherein an erasing window is provided in the surface facing the direction to which the terminals of a main body are extended and luminous power of ultraviolet rays applied to the window is reduced unless the posture of the main body is upside-down. CONSTITUTION:An EP-ROM is constituted by a main body 1, an erasing window 2 provided in it and terminals 3 attached to the main body 1. The erasing window 2 is positioned on the bottom side of the main body 1 at the center of the surface 1' facing the direction to which the tips of the terminals 3 are extended. A light shielding label is stuck on the erasing window 2 of such EP-ROM. Even if the label comes off, as the erasing window 2 is provided on the bottom side of the main body 1, luminous power of ultraviolet rays applied to the window 2 can be significantly reduced compared to the conventional structure in which the erasing window 2 is provided on the top side of the main body 1 as far as the top-and-bottom posture of the main body 1 is kept as it is.

10. 发明专利

JP2006004487A Optical disk access method, access program, and optical disk apparatus 审中-公开
标题翻译：光盘访问方法，访问程序和光盘设备
公开(公告)号：JP2006004487A
公开(公告)日：2006-01-05
申请号：JP2004177936
申请日：2004-06-16
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： HOSOYA TAKASHI , OTSUKA RITSUICHI , KATO KAZUTOSHI , ITO KENICHI
IPC分类号： G11B20/10 , G11B20/18
摘要： PROBLEM TO BE SOLVED: To enable write-in of data after occurrence of an error by enabling reading out written data surely, on the occurrence of a write-in error for a DRAW type.
SOLUTION: In data write-in processing for a DRAW type optical disk 3, data 201, 202 and management information 210 indicating a write-in position of the data are written in the disk, the written management information 201 is read out and existence of an error during write-in/read-out is discriminated. When it is discriminated that an error exists in the read out management information 210a, management information 210b is made again, it is written in a new position on the disk.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：为了在出现错误时能够通过使读取写入数据确实地读取写入数据，就可以在DRAW类型的写入错误发生时写入数据。解决方案：在DRAW型光盘3的数据写入处理中，数据201,202和指示数据的写入位置的管理信息210被写入盘中，读出写入管理信息201 并且识别在写入/读出期间存在错误。当判断出读出管理信息210a中存在错误时，再次执行管理信息210b，将其写入盘上的新位置。版权所有（C）2006，JPO＆NCIPI

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