• Toolz
  • #! Die-hard
  • Offline
  • From: Asia
  • Registered: 2009-02-02
  • Posts: 937

Topic: Benchmarking SD cards

Anybody know a program for benchmarking SD cards - through built-in reader as well as USB-attached reader? Reason I ask is that I got strange results under Windows. Is it normal for built-in reader to have much worse transfer rates but much lower access times? Read rate is only 7MB/s in built-in reader and more than double in USB-attached reader. It might be a Windows issue so I'd like to try in Crunchbang.

  • Toolz
  • #! Die-hard
  • Offline
  • From: Asia
  • Registered: 2009-02-02
  • Posts: 937

Re: Benchmarking SD cards

Best solution I've found is this:

sudo hdparm -tT /dev/sdb

I also found a one-liner that times a simple dd operation - I don't have it to hand right now.

  • Kyte
  • #! Junkie
  • Offline
  • From: midwest usa
  • Registered: 2009-07-19
  • Posts: 275

Re: Benchmarking SD cards

Hi,
I don't know about Linux vs Windows but, depending on the physical system's age and how it was built, sometimes the physical hookup of an sd cards ports to the mother board had different rates than a card reader going through a usb port.  However, supposedly, the newer don't.
 
My first game system had a front panel that was very slow compared to a card reader hooked into a usb port in the back, and the computer guy said it was because the front panel was hooked into the board differently than the usb ports in the back and the usb ports in the back read faster even though the data was going through the wire from the external card reader.  That was kind of confusing.

Basically the physical hookup on the board can affect the speed of the transfer.

Kyte

Kyte: Always flittin' around with his head in the clouds!
  • Toolz
  • #! Die-hard
  • Offline
  • From: Asia
  • Registered: 2009-02-02
  • Posts: 937

Re: Benchmarking SD cards

Thanks to Iggy's post, just found out about iozone.

Seems to be in the repos and there's a version for Windows. Giving it a try.