On 11/27/25 2:26 PM, home user via users wrote:
While working on my back-up recovery, I wanted to compare 2 large
directories:
* one on the hard drive, and
* one on a blu-ray (/run/media/root/[directory]
It took a mere 37 seconds. The directory is about 6.7 GB (not Gb). I
do not believe that the diff could have done that comparison anywhere
near that fast.
I've seen this before.
What do I need to do to be sure that diff really checks every bit?
Reading the other thread, I think this description is a bit misleading.
You're not diffing off the blu-ray drive itself, you made a copy to the
hard drive. Depending on how much RAM you have, a lot of that copy
could be still in RAM cache. Also, I assume you have an SSD or NVME
drive and depending on exactly what that is, it could be extremely fast.
I have an NVME in this computer and I just did a speed test and got
2GB/s read speed. That might be a reasonable time. Did you get a
reasonable output?
--
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