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本帖最后由 itany 于 2009-7-30 01:16 编辑
想请问一下bcyj_大怎么理解这段话的含义：(汗，‘J_大’都被水产了啊)
来自您提供的文章：http://www.computerworld.com/s/article/9132668/Analysis_SSD_performance_is_a_slowdown_inevitable_?taxonomyId=19&pageNumber=3
According to Bob Merritt, an analyst with research firm Convergent Semiconductors, another element of SSD longevity is whether extra memory cells are available and, if so, how many. Some manufacturers over-provision storage, so that when blocks of flash memory wear out, additional blocks become available. For example, a drive may be listed as offering 120GB of memory, but may actually contain 140GB of capacity. The extra 20GB remains unused until it's needed.
The performance problems involving Intel's consumer-grade X25-M SSD were related to its wear-leveling algorithm.
At its most basic, wear-leveling algorithms are used to more evenly distribute data across flash memory so that no one portion wears out faster than another, which prolongs the life of whole drive. The SSD's controller in wear-leveling operations keeps a record of where data is set down on the drive as it's relocated from one portion to another.
"To accomplish this, you need to move commonly used data to different locations, which naturally leads to some data fragmentation, depending on the size of the data blocks required," said Jim McGregor, chief technology strategist for research firm In-Stat Inc. |
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发表于 2009-7-29 18:58
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