Method and system for maintaining directory consistency in magne

Details Method and system for maintaining directory consistency in magne Method and system for maintaining directory consistency in magne

1993-07-09

1994-08-09

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

369 59, 395425, 395575, G11B 509, H04N 576

Patent

active

053371976

ABSTRACT:
The invention provides a system and method for making a data update, such as a directory update, to a magneto-optic disk which includes: copying designated directory sectors from the disk to a cache buffer, the designated directory sectors containing the portion of the directory which is to be updated; updating the directory portion to be updated in the cache buffer to provide an updated directory portion; writing the updated directory portion to a directory consistency block on the disk so as to provide a backup of the updated directory portion; erasing the designated directory sectors from the disk; writing the updated directory portion from the cache buffer to the designated directory sectors; verifying that the updated directory portion has been written to the designated directory sectors on the disk; and erasing the directory consistency block if there is verification that the updated directory portion has been written to the designated directory sectors on the disk. The system and method may further include recovery of the updated directory portion from the directory consistency block if the updated directory portion has not been written to the designated directory sectors, which would be evident from the non-erased state of the directory consistency block.

REFERENCES:
patent: 4788672 (1988-11-01), Toyooka et al.
patent: 5048004 (1991-09-01), Deguchi et al.
patent: 5062009 (1991-10-01), Yamagata et al.
J. E. Kulakowski, R. J. Means, G.F. Sims and M. Tayefeh, "Erase Detection and Error Recovery for Optical Files," IBM Technical Disclosure Bulletin, vol. 32, No. 6A, Nov. 1989, pp. 319-324.
T. J. Friedl, L. E. Gregg, D. F. Nagle and R. K. Rolfe, "Error Recovery for Magneto-Optical Disks," IBM Technical Disclosure Bulletin, vol. 32, No. 8B, Jan. 1990, pp. 411-414.

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