Tdk Corporation

Hiroyuki Ohba

Takuma Mitsunaga

Kenzo Kita

Takuma Tominaga

The memory controller forms temporary virtual blocks each composed of a plurality of physical blocks, whose physical addresses are the same value, each of which is included in each of flash memories, extracts temporary virtual block to which at least one defective block belongs from the temporary virtual blocks, generates a second temporary virtual block to which a defective block does not belong by replacing a defective block belonging to one temporary virtual block with a normal block belonging to another temporary virtual block among temporary virtual blocks extracted, and allocates temporary virtual blocks not extracted and second temporary virtual blocks generated to available virtual blocks.

Memory controller, flash memory system with memory controller, and method of controlling flash memory

In a case where at least one of physical blocks composing the virtual block becomes a defective block, use of the virtual block to which the defective block belongs is forbidden and the virtual block of which use is forbidden is managed as a defective virtual block. Replacing the defective block with a normal block is performed among the defective virtual blocks so as to generate the virtual block to which the defective block does not belong. Then use of the virtual block generated is allowed.

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Tokyo, Japan

Hiroyuki Ohba