Flash solid state disk card with selective use of an address con

Details Flash solid state disk card with selective use of an address con Flash solid state disk card with selective use of an address con

1996-03-11

1998-04-21

Gossage, Glenn

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711115, 711206, 711202, G06F 1210, G06F 1200

Patent

active

057429340

ABSTRACT:
A flash solid state disk card comprises a flash memory comprising M block or M blocks and r redundant blocks, and an address conversion table which outputs a physical sector number 1 to N, or 1 to N and (M+1) to (M+r) in correspondence to an input of a logical sector number 1 to N. The number of blocks M is larger than N. If data in a block for a logical sector number (LSN) having a value L, equal to or less than N is updated, another data are erased in a block for a physical sector number (PSN) determined by the address conversion table, the data are written to a free block, and a physical sector number in correspondence to the logical sector number LSN=L in the address conversion table is changed to a number of the block to which the data to be updated are written. If a logical sector number (LSN) having a value L is equal to or less than N, data are read from a block for a physical sector number in correspondence to the logical sector number LSN=L in the table, otherwise data are read from a block for a physical sector number PSN=L. Thus, a flash solid state disk card can be used efficiently for a longer time. Preferably, a substitution table is provided for defective blocks to substitute a block for a defective block.

REFERENCES:
patent: 5113512 (1992-05-01), Miki et al.
patent: 5124987 (1992-06-01), Milligan et al.
patent: 5359570 (1994-10-01), Hsu et al.
patent: 5627783 (1997-05-01), Miyauchi

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