Yeah, it works fine for me.
First thought that came to mind was running a simple test like reading some 10K random 512 bytes sector reads from the hard drive, as such a big quantity of sectors and so spread out would be unlikely to be cached by the OS. Mechanical drives (even hdd with some nand cache) would have high seek times, while SSDs and ram drives would be fast. NAS drives may be somewhere in between, due to tcp/ip and all that.
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