may be.
But DB files too fragmented.
and for example uTorrent writes clean continuous blocks from beginning of drive as you can see on picture, even thousand files in torrents.
So I think this is bug of bitcoin core .
uTorrent allocates space upfront, for a file with a known file size. Bitcoin Core writes files year after year, it writes wherever your disk has some space available at that moment. And since you use your computer for other tasks too, the "empty spots" on your disk change location. It would make no sense to reserve 500 GB upfront when you first install Bitcoin Core, to prevent fragmentation in the years to come.
The easiest solution is simply not to worry about it, your computer doesn't need to defragment files all the time.
But if you really want to, move Bitcoin Core to a different disk, and it will be completely sequential.
The sync speed - in my experience - mainly depends on your system's memory, and how efficiently your computer uses it. For comparison: I get about 1 block per second, on an i3 with hdd, Linux and 12 GB RAM.
