tonymcconnell
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RPI3 breaking SanDisk SDHC cards?

Wed Apr 06, 2016 11:31 am

Hello,

Recently got a new RPI3, 2.1A supply, and a Sandisk SDHC 16GB SDSQUNC-016G-GN6MA

Downloaded NOOBS 1.9 and unzipped onto the SDHC card. All good so far, files can be seen on the card on several different windows/linux computers.

RPI3 not powered, plugged into USB keyboard/mouse, HDMI 1080P monitor.

Plug card into RPI3.

Power RPI3. Solid red light for 5 minutes.

Turn power of RPI3, remove SDHC card.

SDHC card now unreadable via any mechanism.

I have replaced both the RPI3 and the SDHC card (same model)

Is this expected, as it's extremely frustrating?

Cheers

Tony

tonymcconnell
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Re: RPI3 breaking SanDisk SDHC cards?

Wed Apr 06, 2016 12:42 pm

Got a Transcend SDHC with NOOBS pre-installed. Now boots.

So, PI seems to be irretrievably breaking the SanDisk cards.

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JRV
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Re: RPI3 breaking SanDisk SDHC cards?

Wed Apr 06, 2016 12:49 pm

I have had good luck with two Sandisk 16 gig class 10 cards, both in model threes. I used dd to load the image so I have no experience with Noobs.

tonymcconnell
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Re: RPI3 breaking SanDisk SDHC cards?

Wed Apr 06, 2016 12:55 pm

Yes, it's odd. I've been googling for SDSQUNC-016G-GN6MA and seen a few benchmarks where the card is used. Very peculiar.

The cards are now *un*recognisable via fdisk, within various different USB card readers, and operating systems.

dchao99
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Re: RPI3 breaking SanDisk SDHC cards?

Wed Apr 06, 2016 12:56 pm

tonymcconnell wrote:Hello,

Recently got a new RPI3, 2.1A supply, and a Sandisk SDHC 16GB SDSQUNC-016G-GN6MA
Did you get you Sandisk card from a reliable source? There are a lot of counterfeit cards around.
I'm using a Sandisk extreme plus 16GB and an ultra 32GB with no problem at all.

tonymcconnell
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Re: RPI3 breaking SanDisk SDHC cards?

Wed Apr 06, 2016 1:50 pm

Yes both SanDisk and Pi bought from Farnell.

I've never had any similar problem with Pi 1 / 2.

tonymcconnell
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Re: RPI3 breaking SanDisk SDHC cards?

Thu Apr 07, 2016 9:15 am

So, this morning, after having shutdown the pi correctly yesterday via gui shutdown menus, the PI will not boot.

The SD Card is again unreadable on any computer.

It's a transcend 9181AA 16G 07SS2, this time.

tonymcconnell
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Re: RPI3 breaking SanDisk SDHC cards?

Thu Apr 07, 2016 9:32 am

Wonder if it's the power supply? It's a:

MW Switching power supply, model MWUSB3UK
PRI: 100-240V ~60/50 Hz 260mA
SEC: 5V 2100mA
I.T.E Power Supply

tonymcconnell
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Re: RPI3 breaking SanDisk SDHC cards?

Thu Apr 07, 2016 9:37 am

If anyone fancies buying one to try it out, I'd be both very surprised and grateful at the same time ;)

fruit-uk
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Re: RPI3 breaking SanDisk SDHC cards?

Thu Apr 07, 2016 9:38 am

Are you allowing the Pi to fully shut down before removing power?
The green LED should flash 7 or 8 times IIRC before it's safe to swirch power off

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RaTTuS
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Re: RPI3 breaking SanDisk SDHC cards?

Thu Apr 07, 2016 9:39 am

can you measure the power on the test points of the RPI
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tonymcconnell
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Re: RPI3 breaking SanDisk SDHC cards?

Thu Apr 07, 2016 10:05 am

fruit-uk wrote:Are you allowing the Pi to fully shut down before removing power?
The green LED should flash 7 or 8 times IIRC before it's safe to swirch power off
Yep, I'm allowing the PI to shutdown correctly, before removing the power. In any case, wouldn't that just corrupt the card file system rather than rendering it undetectable?

tonymcconnell
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Re: RPI3 breaking SanDisk SDHC cards?

Thu Apr 07, 2016 10:08 am

RaTTuS wrote:can you measure the power on the test points of the RPI
OK, cheers, I'll give that a go.

fruit-uk
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Re: RPI3 breaking SanDisk SDHC cards?

Thu Apr 07, 2016 10:22 am

tonymcconnell wrote:Yep, I'm allowing the PI to shutdown correctly, before removing the power. In any case, wouldn't that just corrupt the card file system rather than rendering it undetectable?
Depends which bits on the card it corrupts

tonymcconnell
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Re: RPI3 breaking SanDisk SDHC cards?

Thu Apr 07, 2016 11:08 am

RaTTuS wrote:can you measure the power on the test points of the RPI
OK, I've got my picoscope out and checked against PP2. Shows the supply is bang on 5vdc, PP8 at 3.3vdc, PP9 at 1.8vdc no spikes on power on, PP2 straight up to 5vdc where it remains.

Power on scope picture attached. Takes around 200ms to completely drop to ~0vdc when powered off.
20160407-0001.png
Picoscope on PP2
20160407-0001.png (21.23 KiB) Viewed 4859 times

alphanumeric
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Re: RPI3 breaking SanDisk SDHC cards?

Thu Apr 07, 2016 12:15 pm

I'm using a SanDisk Ultra 8 GB Class 10 card in my Pi3B. I've had it in and out of the Pi several times, and plugged into my PC with no issues. I've reimaged it a couple of times. Not because it got corrupted, just as a result of doing stuff and having to start over again etc. I have one USB card reader that errors out writing an image via the win32 disk imager for some reason? It works fine in every other aspect though? I can copy and read files in Windows and on the Pi, it just won't image a card correctly. I just use a different USB card reader to image my uSD cards.

tonymcconnell
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Re: RPI3 breaking SanDisk SDHC cards?

Thu Apr 07, 2016 1:09 pm

Right, I'm off to Farnell to buy another SDHC card with NOOBS preinstalled.

Also, I'm buying an official RPI2/3 power supply.

If it trashes another SDHC again, I'm getting a Pine 64 :P

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RaTTuS
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Re: RPI3 breaking SanDisk SDHC cards?

Thu Apr 07, 2016 1:11 pm

you may have a rouge RPi - RMA it is it is
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jamesh
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Re: RPI3 breaking SanDisk SDHC cards?

Thu Apr 07, 2016 1:17 pm

RaTTuS wrote:you may have a rouge RPi - RMA it is it is
This. I suspect a HW fault with the Pi. Seems the best logical conclusions.
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tonymcconnell
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Re: RPI3 breaking SanDisk SDHC cards?

Thu Apr 07, 2016 1:21 pm

RaTTuS wrote:you may have a rouge RPi - RMA it is it is
I am definitely beginning to see rouge ;)

Yeah, that's what I thought when my first SanDisk was trashed. So I RMA'd the Pi and the SanDisk at the same time.

Got a new PI, new SanDisk, and it was trashed after powering on the Pi (never booted, solid red-light).

Got a NOOBS Transcend SDHC, powered on and booted :)

Shut down (properly), powered off.

Following day, will not boot. Transcend card now trashed.

Constant through this is the PSU.

Hence my last go at replacing the PSU (though it looks to function OK to me) and getting another NOOBS Transcend card.

Hard to believe I could have two bad Pi's on the trot, though things do go bad in batches occasionally.

tonymcconnell
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Re: RPI3 breaking SanDisk SDHC cards?

Thu Apr 07, 2016 1:23 pm

jamesh wrote:
RaTTuS wrote:you may have a rouge RPi - RMA it is it is
This. I suspect a HW fault with the Pi. Seems the best logical conclusions.
I agree, which is why I RMA'd the PI and am puzzled as to why my problems continue.

tonymcconnell
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Re: RPI3 breaking SanDisk SDHC cards?

Thu Apr 07, 2016 3:14 pm

OK, so I've now got my new NOOBS SDHC plus official raspberry Pi 2.5a PSU.

Just booted into raspbian successfully.
Shutdown, power off.
Power on, still boots.
Browsed internet a bit.
Shutdown, poweroff.
Power on, still boots.
Shutdown, poweroff.
Power on, still boots.

You spot the pattern? ;)

At this point, in the interests of science, I ought to go back to the original power supply.

But I'm not going to do that :P

rcomeau
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Re: RPI3 breaking SanDisk SDHC cards?

Fri Apr 08, 2016 1:19 pm

I just had a similar experience with 5 Link Depot 16G UHS Speed Class 3 microSD cards bought from Newegg. Virgin copys of Jessie 3/18 work fine at he start, but apt-get update/upgrade will crash the system and can't be repaired. This on Raspberry Pi's 0,2,3 .

alphanumeric
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Re: RPI3 breaking SanDisk SDHC cards?

Fri Apr 08, 2016 1:38 pm

rcomeau wrote:I just had a similar experience with 5 Link Depot 16G UHS Speed Class 3 microSD cards bought from Newegg. Virgin copys of Jessie 3/18 work fine at he start, but apt-get update/upgrade will crash the system and can't be repaired. This on Raspberry Pi's 0,2,3 .
Did you expand the file system first. ;)

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