FreeBSD 8.2-PRERELASE doesn't see slice on SDHC card in
cardreader
Oliver Fromme
olli at lurza.secnetix.de
Tue Dec 21 10:59:27 UTC 2010
Andriy Gapon wrote:
> on 21/12/2010 10:11 Oliver Fromme said the following:
> > Lev Serebryakov <lev at serebryakov.spb.ru> wrote:
> > > I inserted 16Gb SDHC card, with one FAT32 slice (it is card from my
> > > PDA). After that I've tried:
> > > [...]
> > > blob# ls /dev/da0*
> > > /dev/da0
> >
> > # /bin/dd if=/dev/null of=/dev/da0 count=0
> >
> > Then try again.
>
> $ true > /dev/da0
>
> is shorter and less prone to typos.
It's shorter, but not less prone to typos, I think.
If you misspell the command, or your shell's completion
happens to have a bad day, the '>' output redirection will
destroy whatever is on the device. On the other hand,
dd's "of=..." syntax is not understood by other commands,
so it is safe even if you misstype the command. And even
if you accidentally write /dev/zero instead of /dev/null,
the count=0 will save you (and vice versa).
Of course it's probably a good idea to wrap the command
in a shell alias or function (I would call it "probe-sd"
or similar), so neither the length of the command nor the
possibility of typos plays a role ...
Best regards
Oliver
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