Late last year, I published a blog post with comprehensive benchmarks of various microSD cards used with the internal Raspberry Pi 2 reader, based on the comprehensive (and always-up-to-date Raspberry Pi microSD card benchmark page I maintain for the Pi Dramble project). After publishing the blog post, a few different readers pointed me to some overclocking tweaks that could help boost the speeds further for UHS microSD cards, allowing large file I/O speed to double, and random I/O to get a solid boost as well.
Since I'm running a Mac, and don't have a spare linux-running machine that can mount ext4-formatted partitions (like those used by default for official Raspberry Pi distributions like Raspbian on SD cards), I don't have a simple way to mount the boot partition on my Mac to tweak files on the Pi; this is a necessity if, for example, you break some critical configuration and the Pi no longer boots cleanly.
To mount an ext4-formatted SD or microSD card on a Mac, the easiest option is to use VirtualBox (and, in my case, Vagrant with one of Midwestern Mac's Ubuntu boxes). Boot a new linux VM (any kind will do, as long as it's modern enough to support ext4), shut it down, go into Settings for the VM inside VirtualBox and enable USB, then reboot.
Follow these steps once the VM is booted, to mount the flash drive:
I thought I'd post my experience here, for the benefit of others, because I couldn't find a whole lot of information about this specific use of an external USB flash drive.
I have a MacBook Air with a dainty 128GB SSD drive, so I try to keep large files that I rarely use on external drives. I have plenty of external USB and FireWire storage (over 6 TB), and running VMs in either Parallels or VMWare Fusion works great (very highly performant) off any of these external drives.
However, there's no way I'm going to lug around an external hard drive and USB cable (and maybe power adapter) just so I can test things in Internet Explorer (basically, the only use I have for Windows).
Flash Drive to the Rescue!
I found a cheap 32GB USB flash drive that only sticks out of my MacBook Air half an inch, and copies at a consistent rate of 30MB/second (which is quite sufficient for most tasks). Also, the little drive should have very good read performance, since it's not a spinning platter. Write speed wouldn't be anything to brag about, but writing shouldn't happen all that often when simply opening up Internet Explorer—I hope!
How to Stream from Tricaster Broadcast/Pro to Ustream.tv
The following instructions are based on this video, embedded below:
- You need at least version 2.5 of Tricaster software.
- Download 2.5 or later at register.newtek.com (go to my downloads).
- For Watershed, the process is similar, but you need to get the Flash XML file from Watershed directly.
First, you'll need to turn on the Tricaster, and make sure it's connected to the Internet. You should also try to make sure you have a relatively decent (and stable) Internet connection, for obvious reasons. Some problems may be caused by a restrictive firewall, as well, so watch out for that. (Check your Internet upload speed using Speedtest.net - you should have at least 300-500 kbps upload).
Need I say more? This is from a cookie-cutter Wordpress site with some flash mixed in with a template. The flash was only added to make a little transitional animation for the navigation bar.
We need to educate web designers on how they can break free from their Flash comfort zone, save a few hundred bucks in software licenses every year, and make their websites load two to three times faster (not to mention, more quickly and without requiring buggy third party extensions).
95% of Flash use is avoidable and unnecessary, in my opinion.
This article will explain the importance of knowing what your flash sync terminal voltage is, and show you how to measure the voltage to make sure your flash is safe to use with your digital camera.
Ever wonder why your pictures of little items like statues, money, a speaker set, a glass of water, or pretty much anything else in the world that doesn't move often look so washed out and flat? I'm betting that the reason is that you are setting your camera to 'nuke' mode (i.e. blast everything with light from the flash).
Well, I have a quick, and most likely free (if you own a tripod) solution to this problem. And it's pretty darn easy to implement. Here's how you do it:
My brother, Joel, who went to Saint Louis University a few years ago, made two Flash animations about some of the humorous decisions and actions done by the University employees and administration. It's not meant to be an entirely negative presentation, but rather a lighthearted look at some of the crazy bureaucratic policies enforced during Joel's time at the University.
Links to the Animations
Note from Jeff Geerling: The following video and post was created by my brother, Joel, while he was a student at Saint Louis University (which is where I received my bachelor's degree in Philosophy!). I'm reposting his content on my blog since SLU no longer hosts student content on their website. See also: SLU for U (The Original), The Making of SLU for U.
Note from Jeff Geerling: The following video and post was created by my brother, Joel, while he was a student at Saint Louis University (which is where I received my bachelor's degree in Philosophy!). I'm reposting his content on my blog since SLU no longer hosts student content on their website. See also: SLU for U 2 (The Sequel), The Making of SLU for U.