本文介绍了不同类型磁盘的性能特点，包括传统硬盘（HDD）和固态硬盘（SSD）的顺序写入速度、随机写入速度等关键指标，并提到了Jeff Dean的相关演讲作为参考资料。
Disk:
~100MB/S sequential writes
~1.5MB/S random writes
--~10ms to seek
--~5ms on expensive 15k rpm disks
SSD
~100MB/s random writes.
also ,you can find more information about disk from the jeff dean's keynotes.（jeff dean,google fellow）
~100MB/S sequential writes
~1.5MB/S random writes
--~10ms to seek
--~5ms on expensive 15k rpm disks
SSD
~100MB/s random writes.
also ,you can find more information about disk from the jeff dean's keynotes.（jeff dean,google fellow）
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