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* On magnetic media—where seeks are relatively expensive—the log structure may actually make reads much slower, since it [[fragmentation (computer)#External_fragmentation|fragments]] files that conventional file systems normally keep contiguous with in-place writes.
* On flash memory—where seek times are usually negligible—the log structure may not confer a worthwhile performance gain because write fragmentation has much less of an impact on write throughput. However many flash based devices can only write a complete block at a time, and they must first perform a (slow) erase cycle of each block before being able to write, so by putting all the writes in one block, this can help performance as opposed to writes scattered into various blocks, each one of which must be copied into a buffer, erased, and written back.
== See also ==▼
* [[Comparison of file systems]]▼
== References ==
<references />
▲== See also ==
▲* [[Comparison of file systems]]
[[Category:Computer file systems]]
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