

I don’t think it could possibly be measured because it’s something like: (file size ÷ block size) * num_writes
So it entire depends on the types of files, how often you’re utilizing writes to disk…etc. I just wouldn’t worry about it. If you REALLY want to estimate the tax: use iostat to check the number of writes on the drive in the last 24 hours, THEN enable online defrag and check it again in 24 hours. See what the difference is.
It really doesn’t matter for HDD though. Barely probably matters for SSD.








These spam accounts are getting old…