USB flash drive partitions - Page 2

Shay · posted: 2016-02-02 18:22

To me that low CPU percentage, unless I am slamming the work to it , is what I want to see.
As that tells me nothing untoward is running in the background.

Might want to verify which USB version that stick is. And I will admit, some brands are just plain slower than others.
For bootable sticks, I have been happy with Lexar, made by Micron, USB 3.0 sticks.

andfree · posted: 2016-02-02 18:57

If it takes a lot of time for browser to open and I see a low CPU pecentage when, with the other flash, browser opens fast and for this brief space of time I see 100% CPU, I come to the conclusion that with the first flash CPU is not at its best.

I 've no idea how to check the version of USB. The 16gb is a greek brand, so I think this is the case.

Shay · posted: 2016-02-02 20:51

Try to post with out error message.
Keep getting You don't have permission to access /posting.php on this server.

========= SCRAPER REMOVED AN EMBEDDED LINK HERE ===========
url was:"https://www.google.com/#q=test+usb+drive+speed"
linktext was:"https://www.google.com/#q=test+usb+drive+speed"
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There are several there that should help, the nirsoft I like. USB Flash Drive Speed Tests - Any Drive Size

Shay · posted: 2016-02-03 02:53

Been testing my sticks

Code: Select all

# dd if=/dev/zero of=./largefile bs=8k count=10000

Sure a difference
More reading

========= SCRAPER REMOVED AN EMBEDDED LINK HERE ===========
url was:"http://www.binarytides.com/linux-test-drive-speed/"
linktext was:"http://www.binarytides.com/linux-test-drive-speed/"
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andfree · posted: 2016-02-03 12:26

For the 16gb flash drive:

Code: Select all

$ sudo dd if=/dev/zero of=./largefile bs=8k count=10000
[sudo] password for demo: 
10000+0 records in
10000+0 records out
81920000 bytes (82 MB) copied, 1.09322 s, 74.9 MB/s

Shay · posted: 2016-02-03 13:58

Sure beats the 42 I got on my oldest stick.
My normal Lexar USB 3.0 read 241 MB/s. I have 6 of these and they all tested out the same.

Now I only have a USB 2 in this old Dell D630

Test the other stick and it should read better.

May want to replace the 16 with a newer stick for a Bootable USB.

andfree · posted: 2016-02-03 15:51

I get different speeds for the same drive each time. I measured the 16gb drive two times and I got 58 & 78 MB/s. I measured the 8gb drive three times and I got 290, 78, 126. It seems it wins but, on the other hand, the range is too big.

Shay · posted: 2016-02-03 16:26

The first number you got for each device is the one I would believe.
I got some weird high numbers on the next tests until I rebooted rerun the the fist test and got the same number.

Your 16 GB = 58 MBs is probably a older USB 2 stick
The 8 GB = 290 is a newer inside the stick. Possibly it is even a USB 3.0 one. Matches mine real closely.

I pay attention real close when purchasing USB sticks. A lot of the older types are still being pushed to sell them.

Shay · posted: 2016-02-03 18:34

Code: Select all

jim@antix15:~
$ cd /media/sdb1
jim@antix15:/media/sdb1
$ su
Password: 
root@antix15:/media/sdb1# dd if=/dev/zero of=./largefile bs=8k count=10000
10000+0 records in
10000+0 records out
81920000 bytes (82 MB) copied, 0.33741 s, 243 MB/s
root@antix15:/media/sdb1# cd /media
root@antix15:/media# cd sdc1
root@antix15:/media/sdc1# dd if=/dev/zero of=./largefile bs=8k count=10000
10000+0 records in
10000+0 records out
81920000 bytes (82 MB) copied, 0.125843 s, 651 MB/s

We can change the bs=8k to say bs=4k for a different reading.

The slower stick is about 3 years older then the faster stick.

andfree · posted: 2016-02-04 17:25

Unfortunally, I still take different values. I tested three drives, a 4gb, a 8gb (not the same with previous tests because I use it for booting) and the 16gb. First I formatted all of them ext4. I took the values: 77.2 MB/s, 81.0 MB/s, 63.7 MB/s.

I rebooted and tested them in the same order: 153 MB/s, 135 MB/s, 154 MB/s.

I don't know what to say.

Shay · posted: 2016-02-04 18:04

I don't either, unless a cache (?) got built up. Which I believe is happening. and from reading the link I posted.

Mine are formated ext4 and are non-persist bootable AntiX-15 and MX-15 sticks.

Why, I think the first reading is the best one.