Electrical computers and digital processing systems: memory – Storage accessing and control – Memory configuring
Patent
1996-10-25
2000-07-18
Chan, Eddie P.
Electrical computers and digital processing systems: memory
Storage accessing and control
Memory configuring
711173, 707205, 710 56, G06F 1200
Patent
active
060921684
ABSTRACT:
A data computing system has a host computing unit connected to a peripheral data storage system. The data storage system has a storage medium and a storage space manager to manage space on the storage medium. When the host computing unit deallocates a designated storage space by deleting a file or moving data, the host generates a predefined data pattern and writes that data pattern to the storage space being deallocated. The peripheral data storage system detects the predefined pattern and, in response, deallocates the designated storage space to which the data pattern is being written. As a result, the data storage system now reflects the deallocation that has already been realized by the host software. When the host initiates a read operation for a designated storage space, the data storage system determines whether the storage space is presently unallocated. If it is, the data storage system generates the predefined data pattern and sends that pattern back to the host. In this manner, the technique takes advantage of standard write/read protocols to facilitate communication of space management information between the host and data storage system.
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Peter Norton, "The Norton Utilities Advanced Edition," 1988, pp. 212-215.
Chan Eddie P.
Hewlett-Packard Co.
Kim Hong
LandOfFree
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