Month: May 2013

Fun, Geek, RaspberryPi

Speed tests of SD cards on Raspberry Pi

| mgorecki

Here are some speed results of speed of two sd cards on two different Raspberry Pis (old 256MB and new 512MB one). I followed methodology listed on http://elinux.org/RPi_SD_cards:

Write speed
sync; time dd if=/dev/zero of=~/test.tmp bs=500K count=1024; time sync
Read speed
dd if=~/test.tmp of=/dev/null bs=500K count=1024

And here are the results:

SanDisk Extreme class 10 UHS-1 45MB/s
New Raspberry Pi:
 write: 524288000 bytes (524 MB) copied, 27.2083 s, 19.3 MB/s
 read: 524288000 bytes (524 MB) copied, 22.5482 s, 23.3 MB/s
Old Raspberry Pi:
 write: 524288000 bytes (524 MB) copied, 28.5079 s, 18.4 MB/s
 read: 524288000 bytes (524 MB) copied, 22.6449 s, 23.2 MB/s
Centon class 4 (cheap card from Walmart)
New Raspberry Pi:
 write: 524288000 bytes (524 MB) copied, 112.908 s, 4.6 MB/s
 read: 524288000 bytes (524 MB) copied, 30.2082 s, 17.4 MB/s
Old Raspberry Pi:
 write: 524288000 bytes (524 MB) copied, 106.991 s, 4.9 MB/s
 read: 524288000 bytes (524 MB) copied, 27.7869 s, 18.9 MB/s

Result: spend five dollars/pounds more and buy a proper card.

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Fun, Geek, RaspberryPi, Tips and tricks

Playing DVD on Raspberry Pi

| mgorecki

I’m using Raspberry Pi as a media center using raspmbc, which is amazing for streaming (bbc iplayer, 4od) and playing files from NAS and USB. For DVDs I still needed to connect my laptop to TV, which is just an unnecessary effort. Being geek I knew I have to enable RPi to play my DVDs.

First thing I discovered about RPi as DVD is that it let’s you skip all anti-piracy warnings!:
original

People say it will also ignore region protection (quite useful for my collection of dvds I bought in US)!

So what did I need?
* External DVD (I have actually bought a blu-ray external drive from ebay for 15.89GBP + 2.99P&P, which will work with my macbook air as well).
* Powered USB hub. Raspberry Pi won’t provide the drive with enough power. I’m actually connecting the DVD directly to RPi and using the hub to supply power only. It seems RPi can be powered from the same hub via normal USB connection, which eliminates a need for second power supply.
* A bit of the software:
** MPEG2 Licence – 2.4GBP from rasberrypi.org
** DVD plugin for XMBC (OOTB support doesn’t work good enough yet): http://forum.xbmc.org/showthread.php?tid=158896

Et voila!

ps. when you buy stuff from ebay please check if the seller is paying taxes in your country (eg. is company registered in your country). If not, find another one even if you cost you a pound more. Thanks!

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