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




On Sat 15 Apr 2017 at 13:16:54 (-0500), Richard Owlett wrote:
> On 04/15/2017 12:14 PM, 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 ?
> >
> >>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.
> >
> >
> 
> From https://www.cnet.com/products/lenovo-thinkpad-t510/specs/
> I apparently have
> 
> Card Reader
>   Type                 5 in 1 card reader
>   Supported Flash      Memory Stick, Memory Stick PRO, MultiMediaCard,
>     Memory             SD Memory Card, SDHC Memory Card

If I were you, I would try inserting your SD card and _then_ booting
it up. It's quite usual for bootable devices to appear in the BIOS's
Setup Menu only if a device is actually present. (Don't even rely on
a Boot Menu like F12 sometimes gives: check the Setup Menu itself.)
If it's there, promote it to first device to boot, and then boot.
(Don't rely on the promotion to be "sticky". If you ever boot
without a card plugged in, it may be demoted whenever you next plug
one in.)

Cheers,
David.