https://www.youtube.com/watch?v=r3GDPwIuRKI
On Tue, Mar 6, 2018 at 8:22 PM, Russell Senior
wrote:
> Yeah, I understood about the on-SD controller. There is typically
> some kind of ARM-based microcontroller that does all the block-device
> to NAND translation. It is doing something wrong and cl
Yeah, I understood about the on-SD controller. There is typically
some kind of ARM-based microcontroller that does all the block-device
to NAND translation. It is doing something wrong and clearly
dysfunctional now, though. I am sure that I did successful block
operations on the same microSD pre
When I said card controller, I meant the card controller on/in the actual
SD card. Not the piece of HW attached to your computer.
My conclusion at the time I was trying to understand the same behavior was
that the in-card controller must be doing file transactions of some kind.
Not behaving quite
I do not believe that SD cards respond to pure raw block writes from dd.
Not unless the stream looks like files.
I run into the same discovery some time ago. If I remember correctly, dd
didn't overwrite the content even with random data. It could behave
different for different firmware, but I trie
Worthy theories.
I tried deleting the files in the second partition (rootfs), the OS
said they were gone. When I umounted, unplugged, replugged, they were
all there again.
I tried writing over the first 1.5GB of blocks (I got impatient and
control-C'd it after about 5 minutes) with /dev/urandom,
that's only if you want to generate a certain size. otherwise it just keeps
going until it runs out of blocks to fill.
-wes
On Tue, Mar 6, 2018 at 5:08 PM, Tim Garton wrote:
> Don't you need a "count=#" option to dd as well? Not at a computer right
> now otherwise I'd be able to check if that's
Don't you need a "count=#" option to dd as well? Not at a computer right
now otherwise I'd be able to check if that's the case...
On Mar 6, 2018 5:02 PM, "Richard England" wrote:
> On 03/06/2018 04:20 PM, Tomas Kuchta wrote:
>
>> Try to delete the original files first. Then create empty file usi
On 03/06/2018 04:20 PM, Tomas Kuchta wrote:
Try to delete the original files first. Then create empty file using
/dev/zero and copy it to the card. I bet that it will be there on the card
and some of your original data will disappear as result.
My guess is that the card controller is deduplicati
Try to delete the original files first. Then create empty file using
/dev/zero and copy it to the card. I bet that it will be there on the card
and some of your original data will disappear as result.
My guess is that the card controller is deduplicating your /dev/zero blocks
trying to protect the
Today I chanced upon "USPPcap" - a utility designed to capture traffic on
USB ports.
http://desowin.org/usbpcap/tour.html
It seems to me, since the Windows-based software for this thing works well,
and you have a USB->serial adapter, this utility could potentially be used
to monitor the traffic o
On Tue, Mar 6, 2018 at 3:04 AM, Russell Senior
wrote:
> On Tue, Mar 6, 2018 at 3:01 AM, Jim Karlock wrote:
>>
>>> My initial attempt to google this was unsuccessful (most people point
>>> out the write protect tab, not my problem).
>>
>>
>> Bad switch on the write protect tab? (The tab operates a
On Tue, Mar 6, 2018 at 3:01 AM, Jim Karlock wrote:
>
>> My initial attempt to google this was unsuccessful (most people point
>> out the write protect tab, not my problem).
>
>
> Bad switch on the write protect tab? (The tab operates a tiny switch.)
Nope.
I can turn the switch to lock and it mou
My initial attempt to google this was unsuccessful (most people point
out the write protect tab, not my problem).
Bad switch on the write protect tab? (The tab operates a tiny switch.)
thanks
JK
At 01:25 AM 3/6/2018, you wrote:
I started playing with my Pine 64+ quad-core ARM64 board again
I started playing with my Pine 64+ quad-core ARM64 board again
recently. I have a 16GB Samsung EVO microSD card I was using
previously. I started out by zero'ing it:
dd if=/dev/zero of=/dev/sdc bs=1M status=progress
which seemed to finish fine. But when I remove and re-insert it, it
still ha
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