Date: Tue, 21 Dec 2010 11:59:10 +0100 (CET) From: Oliver Fromme <olli@lurza.secnetix.de> To: avg@freebsd.org (Andriy Gapon) Cc: lev@serebryakov.spb.ru, freebsd-geom@freebsd.org Subject: Re: FreeBSD 8.2-PRERELASE doesn't see slice on SDHC card in cardreader Message-ID: <201012211059.oBLAxAm5089755@lurza.secnetix.de> In-Reply-To: <4D106702.7000608@freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Andriy Gapon wrote: > on 21/12/2010 10:11 Oliver Fromme said the following: > > Lev Serebryakov <lev@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 -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M. Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün- chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd It's trivial to make fun of Microsoft products, but it takes a real man to make them work, and a God to make them do anything useful.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201012211059.oBLAxAm5089755>