Another measurement you might like to make would be random reads and/or writes.

Take a look at the debian package called "bonnie++" 

> Provides: bonnie, zcav
> Description: Hard drive benchmark suite.
>  It is called Bonnie++ because it was based on the Bonnie program.
>  This program also tests performance with creating large
>  numbers of files. Now includes zcav raw-read test program.
>  A modern hard drive will have more sectors in the outer tracks
>  because they are longer.  The hard drive will have a number
>  (often more than 8) of zones where each zone has the same number of
>  sectors (due to the need for an integral number of sectors per track).
>  This program allows you to determine the levels of
>  performance provided by different zones and store them in a
>  convenient format for gnuplot. 
>  


On May 29, 2014, at 3:36 AM, Anubhav Yadav <anubhav1...@gmail.com> wrote:

> I have purchased a WD my passport 2.5 inch external portable usb 3.0 hdd.
> I wanted to benchmark the drive after connecting it to my usb 3.0 port.
> 
> I did the following two test already.
> 
> 
> sudo hdparm -Tt /dev/sdc
> 
> /dev/sdc:
> Timing cached reads:   10856 MB in  2.00 seconds = 5431.12 MB/sec
> Timing buffered disk reads: 304 MB in  3.01 seconds = 101.00 MB/sec
> 
> and also this one:
> 
> dd if=/dev/zero of=/media/My\ Passport/output bs=8k count=10k; rm -f
> /media/My\ Passport/output
> 10240+0 records in
> 10240+0 records out
> 83886080 bytes (84 MB) copied, 2.03511 s, 41.2 MB/s
> 
> I tried gnome-disk-utility but it says that since the disk contains a
> GPT, it cannot benchmark the disk.
> 
> Are there any better ways to find out about the read-write speeds of my disk?
> 
> -- 
> Regards,
> Anubhav Yadav
> Imperial College of Engineering and Research,
> Pune.


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