Write-through caching is necessary on external drives in order to maintain reliability and avoid data loss
in situations where the drive controller is compromised through an event (a kernel panic, power failure,
or most commonly – simply being unplugged) where the buffer cache is lost. It is always much safer to
have critical data written to physical disk blocks, despite the high cost of disk I/O operations.
Titany answered the question on April 26, 2022 at 11:57
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