Dell Mini 9 Discussion Discussion on the Dell Inspiron Mini 9.

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mcm95403 mcm95403 is offline
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Default Re: Class 4 vs. Class 6 SDHC cards - 03-17-2009, 04:07 AM

I bought a Class 6 OCZ 16 gig card tonight for $48. Smokin deal and WAY quick. I've been using OCZ ram in all the AMD powered pc's I build for about a year and a half and it's always been great.
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marcmagus marcmagus is offline
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Default Re: Class 4 vs. Class 6 SDHC cards - 03-21-2009, 06:33 PM

Originally Posted by g-nome
I would love to see the stopwatch test on a san disk extreme 3 card which is advertised at 30mb/ assess user value.
As promised, I ran this test today. I did my copying to/from tmpfs to remove the SSD as a variable which might affect the results. Running stock Ubuntu with 2GB RAM (the Kingston HyperX mentioned elsewhere in this forum), with only Terminal and one instance of 'htop' running. /tmp mounted on tmpfs, which is what I used for the copies. Typescript edited to remove control characters:

I used the new SanDisk ExtremeIII 4GB SDHC (Class 6); the box it came in actually advertises 20MB/s or 133x, and doesn't specify whether that's read or write speed.

I also tested a Kingston 2GB MicroSD [SD-C02G] I had around for comparison.

Summary: both cards get about 10MB/s read, the SanDisk gets about 10MB/s write, the Kingston about 5BM/s write.

My desktop, under light load, takes about 6m to do the same read from the SanDisk through an all-in-1 USB reader, which isn't all that useful of a comparison.

Originally Posted by typescript
Script started on Sat 21 Mar 2009 01:53:49 PM EDT
magus@magus:~$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 3.4G 2.6G 655M 81% /
varrun 1009M 100K 1009M 1% /var/run
varlock 1009M 0 1009M 0% /var/lock
udev 1009M 36K 1009M 1% /dev
devshm 1009M 12K 1009M 1% /dev/shm
gvfs-fuse-daemon 3.4G 2.6G 655M 81% /home/magus/.gvfs
tmpfs 1009M 12K 1009M 1% /tmp
magus@magus:~$ ls -l /media/disk/big_file.avi
-rwxr-xr-x 1 magus magus 367148520 2009-03-20 17:55 /media/disk/big_file.avi
magus@magus:~$ echo "SanDisk ExtremeIII 4GB SDHC"
SanDisk ExtremeIII 4GB SDHC
magus@magus:~$ time cp /media/disk/big_file.avi /tmp

real 0m34.580s
user 0m0.036s
sys 0m2.500s
magus@magus:~$ time cp /tmp/big_file.avi /media/disk/big_file2.avi

real 0m36.210s
user 0m0.012s
sys 0m2.384s
magus@magus:~$ rm /tmp/big_file.avi
magus@magus:~$ time cp /media/disk/big_file.avi /tmp

real 0m1.004s
user 0m0.004s
sys 0m1.000s
magus@magus:~$ umount /media/disk/
magus@magus:~$ echo "Kingston 2GB microSD"
Kingston 2GB microSD
magus@magus:~$ rm /tmp/big_file.avi
magus@magus:~$ time cp /media/disk/big_file.avi /tmp

real 0m34.952s
user 0m0.028s
sys 0m2.480s
magus@magus:~$ time cp /tmp/big_file.avi /media/disk/

real 1m0.154s
user 0m0.020s
sys 0m2.696s
magus@magus:~$ exit

Script done on Sat 21 Mar 2009 02:06:29 PM EDT
(Note that some sort of effective caching somewhere meant doing multiple copies to smooth out any variance would have been more effort than I wanted to put in; sorry. It's nice to know the cache works, though.)

Black Mini 9 | 4GB SSD | [s:1kutak77]512MB RAM[/s:1kutak77] | [s:1kutak77]Ubuntu[/s:1kutak77]
RAM: Kingston HyperX 2GB 533MHz DDR2 CL3-3-3-8
OS: Gentoo Linux, ion3 WM
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