On 11/27/25 4:43 PM, home user via users wrote:
On 11/27/25 5:30 PM, Samuel Sieb wrote:
Why would you want to clear the cache?
To be sure that the diff really is comparing the actual source of the cp
and the actual destination of the cp. In the past, it made a huge
difference.
When I backed up 30+ GB of data to a USB stick 7 months ago a year ago,
etc., I wanted to know that what was on the stick matched what was on
the hard drive. Without clearing the cache, the diff took about half a
minute. After clearing the cache, the diff took about 6 minutes. It
matters!
For writing, sure, that's a reasonable test for verification. It would
have been easier to just unmount and mount it again. That would only
clear the cache for the USB drive instead of everything.
Given the problems I've been having with devices and/or removable media,
I think it's wise to do the diff, and to make sure what's on the hard
drive is being compared to what's on the blu-ray, not in cache.
You're *reading* from the blu-ray. Unless you suspect RAM issues, the
cache is good. There's no benefit to forcing a re-read from the blu-ray.
--
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