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Date:      Thu, 09 Apr 2009 19:58:25 -0700
From:      perryh@pluto.rain.com
To:        freebsd@edvax.de
Cc:        freebsd-questions@freebsd.org
Subject:   Re: USB SD-card reader recognized, but not working, on 6.1
Message-ID:  <49deb5d1.syt1ug/OWLKGHOGd%perryh@pluto.rain.com>
In-Reply-To: <20090410003759.dede9c9e.freebsd@edvax.de>
References:  <49de2c9a.QlCBOleCO/iBrMcf%perryh@pluto.rain.com> <20090409181009.GA38361@slackbox.xs4all.nl> <49de50cb.gcYrr9F1eSmdUBu9%perryh@pluto.rain.com> <20090410003759.dede9c9e.freebsd@edvax.de>

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Polytropon <freebsd@edvax.de> wrote:
> On Thu, 09 Apr 2009 12:47:23 -0700, perryh@pluto.rain.com wrote:
> > It's an SD card, not a "drive", so I had not expected it to be
> > partitioned; but yes, it is:
> > 
> > $ ls -l /dev/da0*
> > crw-r-----  1 root  operator    0, 244 Feb 14 15:09 /dev/da0
> > crw-r-----  1 root  operator    0, 245 Feb 14 15:09 /dev/da0s1
>
> Why don't you expect this? As far as I know, if something is
> msdosfs-formatted (read: any "Windows" readable file system,
> FAT), it always involves a "slice device". I never found a
> situation where access to /dev/da0 would work.

My experience is exactly the reverse.  I've never before seen a
removable-media device (floppy, Zip-drive, JAZ drive) that *did*
have a DOS "partition" table aka BSD "slice" table.  Surely you
would not expect a USB floppy to show up as /dev/da0s1?

AFAIK the reason for creating slices is to identify sections of
the device for use by different OS -- something often needed
for multi-boot from a hard drive but seldom on removable media.
I sure wasn't planning to use part of this SD card for my camera
to store pictures on, and the rest for FreeBSD backups :)



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