Forum Revamp
#20
(04-19-2016, 04:42 AM)tkaiser Wrote: But the problem is that you get fake cards from every retailer out there (see the 'On counterfeit SD cards' info). The other problem is that if you really have a look into the SD card business you quickly come to the conclusion that you only want to buy SD cards from vendors that run their own NAND factories, that produce their own controllers and combine both to retail products. And then you already end up with exactly 4 manufacturers out there: 2 names start with S, the other 2 with T.

If you then have a look at the Pine64' SDIO implementation (sequential transfer speeds max out at ~22/23 MB/s), keep in mind that on SBCs random I/O is more important, then have a look at recent research on performance in this area (please have a look at the collective benchmarking done here), then you end up with 2 different card types you could recommend (either normal Samsung EVO or EVO+ or SanDisk Extreme Plus when you also care about maximum longevity).

Regarding 64GB cards it's easy: choose EVO/EVO+, regarding 128GB or larger it's also easy: If you don't need maximum mobility better think about combining a small SD card with any USB solution for the same price (again: random I/O is more important -- something no one wants to realise that an SBC is different than a digital camera where only the 'speed class' matters) and in case you try to make any 'good deal' you get a fake card anyway. 64GB is the reasonable maximum at the moment. That might change in half a year.

Regarding PSUs most people forget the cable between PSU and board: High resistance --> low fun (since voltage drops will lead to stability issues or a 'bricked' board. Looking at amperage ratings is pretty useless if you forget the voltage drop issue -- won't repeat it again, there are already a couple of posts here that outlined that)

In case anyone wants to add that to some sort of documentation: Feel free to do so. Since none of the above is Pine64 specific but applies to other SBC as well and other/better ressources already exist, time to stop here.
Just to reiterate some of the most important things here. 
But the problem is that you get fake cards from every retailer out there
Yes, you can get fakes from Amazon, Newegg, Best Buy, Walmart, just about anywhere because most of these companies buy from a middle man to get the best prices possible and you never know where that middle man got his last shovel full of microSD from. 

Pine64' SDIO implementation (sequential transfer speeds max out at ~22/23 MB/s)
No point in going crazy and buying a 2,999X transfer rate card. If all you can let through if 5gallons per hour, there is no reason to have the city come out and hook up a 22" water main, you will never see any benefit. 

most people forget the cable between PSU and board
I was part of a kickstarter years back for a usb power meter, it measured current use by measuring the voltage drop across a resistor. Not uncommon practice. Unfortunately the voltage drop caused the phone I was using back then to drop into a slow charge mode, because if it saw a voltage below 5v it assumed it was pulling too much current from the charger causing a voltage drop and was over stressing the charger so it would drop its current demands. Myself and another person were able to duplicate this finding using cheap usb cables in place of that meter. 

And I have said it before and I will say it again. A phone charger is NOT a power supply. It may meet the ratings needed for voltage and current but most use some form of smart signaling and the Pine will not talk to them. Ever. A good 12v 2A power supply should cost you less than $15. Old laptop and external hard drive power supplies can be a great find, pawn shops, flea markets, etc if you are really cheap. Then spend a few bucks on a good DC-DC adjustable supply, my current favorite is this style http://www.ebay.com/itm/LM2596-USB-DC-DC...1833093030 I have been using one with my pine since day 1 and its been flawless.

If you cant boot your Pine, the first two things folks are going to ask about are power and sd. If you are unwilling to put your own devices under scrutiny, maybe you should just read. Running the SD card checks is easy, and doesnt take all that long.


Messages In This Thread
Forum Revamp - by Ghost - 04-17-2016, 12:27 PM
RE: Forum Revamp - by tkaiser - 04-17-2016, 12:34 PM
RE: Forum Revamp - by Ghost - 04-17-2016, 12:43 PM
RE: Forum Revamp - by rahlquist - 04-17-2016, 01:57 PM
RE: Forum Revamp - by tkaiser - 04-17-2016, 02:02 PM
RE: Forum Revamp - by rahlquist - 04-17-2016, 12:43 PM
RE: Forum Revamp - by androsch - 04-17-2016, 02:33 PM
RE: Forum Revamp - by Ghost - 04-17-2016, 03:18 PM
RE: Forum Revamp - by TeaPack - 04-17-2016, 03:39 PM
RE: Forum Revamp - by androsch - 04-17-2016, 03:48 PM
RE: Forum Revamp - by Ghost - 04-17-2016, 04:16 PM
RE: Forum Revamp - by Ghost - 04-17-2016, 09:22 PM
RE: Forum Revamp - by tkaiser - 04-18-2016, 12:46 AM
RE: Forum Revamp - by tllim - 04-18-2016, 10:09 AM
RE: Forum Revamp - by tllim - 04-19-2016, 05:44 AM
RE: Forum Revamp - by damikeh - 04-18-2016, 03:02 AM
RE: Forum Revamp - by tkaiser - 04-18-2016, 03:32 AM
RE: Forum Revamp - by damikeh - 04-19-2016, 01:14 AM
RE: Forum Revamp - by tkaiser - 04-19-2016, 04:42 AM
RE: Forum Revamp - by rahlquist - 04-19-2016, 05:46 AM
RE: Forum Revamp - by tkaiser - 04-19-2016, 06:22 AM

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