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Re: Possibly erroneous "device not present" message during boot




On Sat 15 Apr 2017 at 19:14:24 (+0200), Pascal Hambourg wrote:
> Le 15/04/2017 à 16:28, David Wright a écrit :
> >On Sat 15 Apr 2017 at 11:05:12 (+0200), Pascal Hambourg wrote:
> >
> >>A SD card reader such as the one the OP has just exposes the SD card
> >>as what it is, a SD/MMC card (/dev/mmcblk*).
> >
> >I assumed that the OP, writing about a laptop, had no card reader,
> >and was inserting the SD card directly into the computer.
> 
> How do you name that slot on the laptop or desktop where you insert
> the SD card, if not an embedded card reader ?

A slot, or an SD slot (as on this Dell), or a micro SD slot.

You seem to have had some difficulty with this part of my post:

| It's not clear to me why an SD is being used in this way as the OP
| has at last revealed that the computer is unable to boot from an SD
| plugged in directly. (Of course, an SD card can be made to look like a
| USB stick just by sticking it in a card reader. Then it will boot.)

I would be happy to go through it and detail all the referents
if you can't judge them from the context.

> >As it happens, if you do this with the ancient laptop I'm typing on,
> >it has the functionality of a card reader built into it and you get
> >a /dev/sd*, and that can be boot an SD card directly.
> 
> So there seems to be at least two kinds of SD card reader : those
> which expose themselves as a USB mass storage device and those which
> expose themselves as a SD/MMC device.
> 
> I have a couple of desktops with an embedded multi-card reader,
> connected to an internal USB port on the motherboard. But I do not
> have any SD card (no use), so I never checked to see what kind they
> are.

I would imagine that most people wouldn't want to disassemble to check
this. The internal connections are likely subminiature anyway, so it
would be difficult to see how any card will appear to the user without
just inserting one.

Cheers,
David.

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