Dennis Lee Bieber  writes:
> "nelso...@gmail.com"  declaimed the following:
>>Why is /dev/sdc so slow runnning through same usb3 hub as /dev/sda
>> and /dev/sdd?  I don't think it is rotation speed of drives.
>>
>  I'd blame rotation speed with a fragmented file system -- fragmentation
> and head seeks means waiting for the platter to rotate the next desired
> sector into position.
>
>  It's also a larger drive, and if inodes are stored in one area, with
> data stored elsewhere, and the journal somewhere else, there could be a lot
> more seeking being performed.

Filesystem layout isn’t relevant here. ‘hdparm -t’ doesn’t measure
filesystem performance, only raw read.

--
https://www.greenend.org.uk/rjk/

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