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METHOD FOR MANAGING FLASH MEMORIES HAVING MIXED MEMORY TYPES USING A FINELY GRANULATED ALLOCATION OF LOGICAL MEMORY ADDRESSES TO PHYSICAL MEMORY ADDRESSES
METHOD FOR MANAGING FLASH MEMORIES HAVING MIXED MEMORY TYPES USING A FINELY GRANULATED ALLOCATION OF LOGICAL MEMORY ADDRESSES TO PHYSICAL MEMORY ADDRESSES
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机译:使用逻辑存储地址到物理存储地址的精细粒度分配来管理具有混合存储类型的闪存的方法
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摘要
A method manages a flash memory for a computer system having flash chips divided into separately erasable physical memory blocks with a limited maximum erasure frequency. The memory blocks are divided into writable pages being subdivided into addressable subpages. The subpages are addressed by a computer via logical sector addresses being converted into physical subpage addresses. The flash memory has a first area containing single-level flash chips with a higher maximum erasure frequency, and a second area containing multi-level flash chips with a lower maximum erasure frequency. If write operations in the first area exceed an upper threshold for a filling level of written memory blocks, a written memory block having a low erasure counter is searched for in the first area, whose valid subpages are transferred into a memory block of the second area. The address allocations for the transferred subpages are updated.
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