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PMI

@W. H. Heydt: I found the problem with my earlier tests, and after starting with a fresh install, and reformatted HDD, I now get more consistent and reasonable results with the tests you posted above: Write: date; dd if=/dev/zero of=testfile bs=1M count=1024; sync; sync; date Read: date; dd if=testf...

PMI

I ran Mate 15.04 from a USB flash drive for a while. Using similar setup directions, on a Pi2B, using the Mate SD card with a modified cmdline.txt, a 16Gb flash drive with expanded root partition. I would not not describe it as painfully slow. Can you give some examples? Do you mean it was slower th...

PMI

...Maybe 16mm. You are correct, 16 mm from the top of the circuit board to the top of the USB sockets. The USB sockets are the highest component, but the Ethernet socket pins are a bit longer under the board. The USB sockets have an insulator under the socket (at least on the Pi2), the ethernet soc...

PMI

I....With the PI3 the drive prevents boot, but when plugged in after boot will spin up and then cut off over and over. With the Pi2 (and my Hudl 2A charger) it will not boot but when plugged in after boot it shows up as /dev/sda - however trying to write to it etc fails with the drive spinning and ...

PMI

...don't see anything on the market that would fit- does anyone know of any cases, or could anyone offer "getting started" advice on how to even design such a case?... This will depend very much on what has to come out of the enclosure, desirable battery life, recharge v. replacement, etc. The simp...

PMI

Tonight I've tried four different 5v PSUs each rated at 5v/2A with both a PI2 and PI3 (determined to get this product working). Then I got a Seagate 1TB USB drive and plugged it straight into the PI2 (with max current = 1) and it not only booted, but mounted quickly and let me read data off it... A...

PMI

...As I noted later on, it's on the wrong end of the drive, to boot. The WD case does pretty much take care of that problem, though... You are absolutely correct. After reading your earlier post, I took a closer look at the triangular light pipe, and there is a tiny, < 1mm right-angle nub which is ...

PMI

http://i1362.photobucket.com/albums/r689/pmiczek/RPi/PiDrive%20Case/Assembly4c_zpsvyliuasp.jpg This is an expandable case made from laser cut acrylic and inexpensive parts found at any local hardware store. It is expandable and intentionally oversized to provide some protection for connectors, and ...

PMI

@crosland: LOL. I was a bit shocked when you posted that... I have no issues powering up with a P2B, even with a drive that consumes more than the PiDrive on powerup, a 2A supply, and other peripherals...

I believe on the Pi3 you no longer have to set the current in config.txt (?)

PMI

It looks good and seems to enclose the Pi and the msata board really well. The magnetic fasteners are a nice touch. I think I would have allowed a small slot in the end of the box for at least one USB cable to come out though. Would not have to be very large, just perhaps a 4~5 mm slot in the edge o...

PMI

Could you explain exactly what I need to do for the Pi 3 when you refer to "using care and taking the time"? You will be buying components separately, so you have to make sure they work together correctly, and it takes time to investigate each one. I did not realize the PiDrive was not available in...

PMI

I saw the post above. I suspect the changes are all in the firmware. The LED even including the light pipe, is still very bright. Someone put blue nail polish over it, and it still outshines the LED in a WiFi dongle. At night it looks like a train is coming at me...

PMI

I think the HDD itself is the same one that was sold as part of the 500G Passport. Some WD emplyee has basically said that in another thread. So the LED location and the two tiny holes are probably the same location, but the light pipe is probably different to fit the Pi-compatible case. Is the loca...

PMI

Alexandre34 wrote:... What I want is to avoid is to open the box to change the SD card.

Just do an internet search for something like "Boot Raspberry Pi from USB drive"... Examples:

viewtopic.php?f=66&t=12015
http://www.instructables.com/id/Boot-th ... -from-USB/

PMI

, if cats on a war footing are going to be roaming Chicago with WiFi transmitters on their backs... I wonder if we should issue birds in Chicago tiny WiFi alarms to warn of felines approaching in the fog?

PMI

True, the HDD will be using 80% of the 1.2A peak, but would 200mA be enough for something like a USB keyboard and mouse? How small of a margin is 200mA? You can use a conventional 2.5 HDD, but it requires some care. W. H. Heydt is correct, but the maximum current is only for a very short time durin...

PMI

rothlive wrote:... I am come from germany.

Ok, no square pegs into round holes...!

How about this one instead?

http://www.modmypi.com/raspberry-pi/acc ... -supply-eu

PMI

Quite sure it was the HDD, yes. (the SD card does not have space left for one 3 Gig file let alone two... ;) ) Just for comparison, I ran the same tests with the drive plugged into my laptop: Write: (3.2 GB) copied, 29.3214 s, 110 MB/s Read: (3.2 GB) copied, 31.4322 s, 102 MB/s Copy: (3.2 GB) copied...

PMI

I will look forward to seeing that. In the meantime, using your test commands including the sync's and the 3 gig file sizes: Write: 293.263 s, 11.0 MB/s Read: 113.475 s, 28.4 MB/s Copy: 516.05 s, 6.2 MB/s A little faster than I got, but in the ballpark. My test was not very rigorous. So, perhaps the...

PMI

...Testing gives (rounded off) write speed of 36MB/s, read speed of 32MB/s and file copy speed of 16MB/s... Can you post a description of how you tested this? I ran a couple quick tests this weekend, using a WD native USB drive, and did not get anything close to that speed on a file copy. I only ha...

PMI

Thanks a lot, that is very helpful!

It means that in my case, I can expect about the same power dissipation, comparing a Pi 2 with a WiFi Dongle, and a Pi 3 with internal WiFi. Perhaps not exactly, but close enough for my purposes...

PMI

Can you please post the current measurement with USB enabled and disabled for comparison, and the power supply voltage when tested? I don't have the Pi 3 yet, but with the Pi 2, and 5.12~5.14V supply voltage, I measured this: 210 mA with no USB devices plugged in 240 mA with wireless keyboard dongle...

PMI

If you post some additional information about this "power bank", you will probably get better advice, but - it is possible that it is sensing too little current during the Pi startup (boot) sequence.

PMI

...Of course, both are back ordered by a month or so. Here's hoping that they arrive fairly close together. Nothing worse than waiting on multiple pieces to complete a project, eh? Not to worry, you should be able to get started with a conventional micro USB cable while waiting for your wonder cabl...

PMI

While waiting, I decided to adapt my audio project case to add a disk drive. Still missing some hardware bits and pieces, but yesterday I finally managed to fit the parts together (using a different USB drive). Since this was supposed to be a headless music player (when I started), the board on top ...

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