Secondary storage device using nonvolatile semiconductor memory

Details Secondary storage device using nonvolatile semiconductor memory Secondary storage device using nonvolatile semiconductor memory

1998-09-25

1999-10-05

Phan, Trong

Static information storage and retrieval

Floating gate

Data security

36518511, 36518529, 36518533, 365218, G11C 1604, G11C 700

Patent

active

059634740

ABSTRACT:
A secondary storage device using a nonvolatile semiconductor memory in which individual block areas constituting the nonvolatile semiconductor memory can be used up to their limit of use. When the number of repetitions of erasure in a second block area has reached a predetermined reference value, a searching unit searches active block areas for an alternate block area. A second writing unit writes information which has been stored in the alternate block area, into the second block area. A second correspondence modifying unit associates the physical block number with the logical block number and causes a logical-physical correspondence storing unit to store the correspondence of the thus-associated block numbers. A second erasing unit erases the information stored in the alternate block area and treats the block area with the physical block number as a spare block area.

REFERENCES:
patent: 5611067 (1997-03-01), Okamoto et al.
patent: 5818771 (1998-10-01), Yasu et al.

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