[PLUG] SD cards always mount read-only
John Jason Jordan
johnxj at comcast.net
Tue Oct 11 18:13:03 UTC 2011
On Tue, 11 Oct 2011 09:03:49 -0700
Paul Mullen <pm at nellump.net> dijo:
>On Tue, Oct 11, 2011 at 06:23:45AM -0700, Rich Shepard wrote:
>> On Mon, 10 Oct 2011, John Jason Jordan wrote:
>>
>> > I find it very strange that my phone has no problem with it; it's
>> > just my Thinkpad that can't write to it.
>>
>> Perhaps Android phones need total control. But, not
>> being able to read them in your laptop is quite strange.
>
>I doubt it. And if it was an issue with the phone's VFAT
>implementation, I expect the laptop wouldn't be able to mount the card
>at all.
>
>John, are you using an adaptor to fit the Micro SD card into your
>laptop's reader? If so, have you tried a different adaptor? It's
>possible the write-protect switch on the adaptor is not quite right
>for the reader in your laptop. (Apologies if this has been covered
>already.)
No, I have another adapter, but 1) I can't find it at the moment and,
2) it came with the Transcend micro SD card that normally lives in my
phone and, when it first arrived ~ six months ago, I tried it with its
adapter in the laptop and it was also read-only. At that time I didn't
follow up on the issue because I intended to use that micro SD card
only in the phone, and it worked fine there.
However, there is a note on the Thinkwiki that some adapters are flaky.
It is entirely possible that both adapters are bad. But if that were
the case I would expect that the card wouldn't mount at all, or mount
but suddenly disappear, or give corrupted reads and writes or something,
not that they would always uniformly mount read-only. But what do I
know? Oh wait ... I do know that this adapter has some peculiarities.
One of the connectors looks like it has a tiny bit of a curve to it,
two of them stick out 1/32 of an inch more than the others, and the gap
between the rightmost two of them is narrower than the others. Not a
sign of good manufacturing quality control.
I suppose I should google on what each of the pins does. But figuring
out what the effects might be for each pin's failure sounds like a lot
of research.
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