Message: 1 Date: Thu, 6 Nov 2014 18:04:16 +1100 (EST) From: Tim Connors <tim.w.connors@gmail.com> Subject: Re: raspberry pi sd cards To: Brian May <brian@microcomaustralia.com.au> Cc: Luv Main <luv-main@luv.asn.au> Message-ID: <alpine.DEB.2.02.1411061803230.20102@dirac.rather.puzzling.org> Content-Type: TEXT/PLAIN; charset=US-ASCII
On Thu, 6 Nov 2014, Brian May wrote:
Anyway, on the assumption that something is wrong with the SD card, are there are known good SD cards I can buy locally?
The list at http://elinux.org/RPi_SD_cards is not helpful, and seems to be full of contradictions.
Make sure your power supply is good.
^^^^ This.
I have read stories of people spending lots of money on SD cards and finding none of them work, so am a bit nervous about doing this myself.
People buying lots of SD cards and none of them working? What's the one common thing amongst all those SD cards? The power supply.
All manner of curious and exciting behaviour stopped once I upgraded my power supply. I also over-specced the current too. When they say "minimum 700mAH", they really mean "it will light up with 700mAH, but its behaviour will be odd at best". (I have the older model B..newer models may ask for more or less power) I bought a quality 2000mAH supply and have had zero issues since (2 years or so). It's quite boring now :) Mine runs headless and has a 32GB USB stick as main storage, with the OS on SD card, so as far as power requirements go, YMMV depending on how you use it. -- - http://surfcoast.redbubble.com | https://picasaweb.google.com/107747436224613508618 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- "Unless someone like you, cares a whole awful lot, nothing is going to get better...It's not !" - The Lorax -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- A committee is a cul-de-sac, down which ideas are lured and then quietly strangled. *Sir Barnett Cocks <http://www.quotationspage.com/quotes/Sir_Barnett_Cocks/>* -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- "A mind is like a parachute. It doesnt work if it's not open." :- Frank Zappa -
> Anyway, on the assumption that something is wrong with the SD card, are > there are known good SD cards I can buy locally? > > The list at http://elinux.org/RPi_SD_cards is not helpful, and seems to be > full of contradictions.
Make sure your power supply is good.
> I have read stories of people spending lots of money on SD cards and > finding none of them work, so am a bit nervous about doing this myself.
People buying lots of SD cards and none of them working? What's the one common thing amongst all those SD cards? The power supply.
*** Absolutely correct! My local Computer tech said to make sure whether the ssd card is 3.3 or 5 volts. If you plug a 3.3 volt card into a 5 volt power supply it will cook instantly hence people having so many cards instantly die. If you plug a 5 volt card into a 3.3 volt supply it will be flaky and possibly die over a short time. The unfortunate thing is, not one of the cards I checked has the voltage marked on it and usually there are no instructions or specifications included. Check your power supply hard drive connector voltage. Go to manufacturer/supplier web sites and verify the voltage of the card/s you wish to purchase. Roger
participants (2)
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Andrew Mather -
Roger