[GTALUG] some USB sticks are slow!

[Nicholas Krause]

On 9/29/19 11:46 AM, D. Hugh Redelmeier via talk wrote:
> I bought some inexpensive SanDisk Cruzer Glide 16GB USB sticks from
> Walmart last year.  Cheap.
>
> Today I copied the CentOS 8 installation image onto one.
>
>    time sudo dd if=CentOS-8-x86_64-1905-dvd1.iso of=/dev/sdg oflag=direct bs=16M
>
> (I used a USB 3 port on my dessktop.)
>
> It seemed to take a long time, so I did this to see if anything was
> happening (the dd process' PID was 29047):
>
>    sudo kill -s USER1 29047
>
> Yes, there was progress, but not as much as I would expect.  The final
> statistics were:
>
>    425+1 records in
>    425+1 records out
>    7135559680 bytes (7.1 GB, 6.6 GiB) copied, 1560.63 s, 4.6 MB/s
>
>    real	26m4.152s
>    user	0m0.072s
>    sys	0m4.706s
>
> This amounts to about 4.56 MB/s.  That's even less than the poor
> Average Sustained Write Speed 7.64 MB/s reported here:
>
>    <https://usb.userbenchmark.com/SpeedTest/2718/SanDisk-Cruzer-Glide>
>
> Note: this stick hasn't been written to often.  It should not be near the
> end of its life (that could slow down a flash device).

I've not needed a new flash drive in awhile but I liked the higher 
perfomance

Kingston and Corsair drives. Not sure how much they are but last thing I

checked it was pretty expensive at around 80 dollars for 128GB. Then again

the speeds were good i.e. 250MBS write that it did hit and around 150MBS

writes. Through if your looking for speed these are amazing as almost as

fast as a SATA 3 SSD around 100MBS slower.

https://www.amazon.ca/Corsair-Flash-Voyager-256GB-Premium/dp/B079NWJTGG/ref=asc_df_B079NWJTGG/?tag=googleshopc0c-20&linkCode=df0&hvadid=292955488960&hvpos=1o1&hvnetw=g&hvrand=3699258915644707733&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9061009&hvtargid=pla-473498336284&psc=1

And yes they do hit though speeds to my knowledge.

Nick

> ---
> Post to this mailing list talk at gtalug.org
> Unsubscribe from this mailing list https://gtalug.org/mailman/listinfo/talk