SD cards speed tests

humpman

Here are the simple instructions.

Download HD_Speed zip file from http://www.steelbytes.com/?mid=20
Extract the HD_Speed.exe executable from the zip file and start it. It may hang for a while (Not Responding) when it starts up because it is scanning your system for drives but eventually will become available.
Set the parameters to Bits/Sec, BlockSize=32KB, Mode=Write and Duration 01:00.
Insert your blank SD card in your computer. HD_Speed will destroy all data on your card.
Choose the appropriate drive letter in HD_Speed and run the test. Be careful here, don't choose your other drives. When you're done, you'll want to format your card before using it.
Report your results in Mbps along with the following information:

Card Reader
Card Brand
Card Type (SD or SDHC or SDXC)
Card Class
Card Size (in GB)
Date Purchased
Card Write Speed (in Mbps) Current and Average

humpman

Card Reader: Ginzzu GR-419
Card Brand: Sandisk Extreme Pro 95MB/s
Card Type (SD or SDHC or SDXC): SDHC
Card Class: 10
Card Size (in GB): 8
Date Purchased: 07.05.12
Card Write Speed (in Mbps) Current and Average: 98.8 and 98.3

humpman

Card Reader: Ginzzu GR-419
Card Brand: Transcend Ultimate
Card Type (SD or SDHC or SDXC): SDHC
Card Class: 10
Card Size (in GB): 8
Date Purchased: 04.12
Card Write Speed (in Mbps) Current and Average: 94.5 and 95.9

Vitaliy_Kiselev

@humpman

It is pointless to post results on cheap USB 2.0 reader.
Get good, fast USB 3.0 reader and do proper tests.

duartix

Transcend 32GB Class 10.

USB3 Card Reader.

Not too shabby, 38€ for 32GB @ 136Mbps it's up there to my previous Samsung 16GB Extreme Speed.

http://usbflashspeed.com/20634

duartix

@humpman: The tool you linked isn't very interesting. It tests write speed from the beginning to the end of the device (which doesn't make sense in this case since a flash device will always write at the same speed independent of the location of the sector).

The same card I presented earlier was steadily writing at 18.4MBs in that tool (HD_Speed) before I ended the test which would I believe would take over 15m to run.

dado023

is HD_Speed reliable test for GH2 usage? My card writes 5GB file from HDD to Transcend SD card with speed of 17MB/s, that equals around 135Mbps

balazer

If HD_Speed shows writes consistently above 17 MB/s in your PC using a non-UHS card reader, then you can assume the card will be capable of at least that when recording video in your GH2.

Speed testing on your PC doesn't generalize to say if the card will be stable or span with aggressive hack settings.