sensitive data ending up in the file-system journal.

Delayed allocation and potential data loss

Because delayed allocation changes behavior that programmers relied on from ext3, the feature poses some additional risk of data loss in cases where the system crashes or loses power before all of the data has been written to disk. Due to this, ext4 in kernel versions 2.6.30 and later automatically handles these cases as ext3 does.

The typical scenario in which this might occur is a program replacing the contents of a file

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