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== Disadvantages ==
* The [[design rationale]] for log-structured file systems assumes that most reads will be optimized away by ever-enlarging memory caches. This assumption does not always hold:
** 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{{Fact|date=November 2008}}.
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