linux-kernel - Re: Problem: non-SDHC 2GB SD cards are unreadable

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Message-Id: <200804141440.48960.arnd@arndb.de>
Date:	Mon, 14 Apr 2008 14:40:48 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Alexia Death <alexiadeath@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: Problem: non-SDHC 2GB SD cards are unreadable

On Monday 14 April 2008, H. Peter Anvin wrote:

> Actually, I believe 2 GB (non-SDHC) *only* have 1024 byte sectors.
> 

Right, I found out the same after reading the page pointed out by Wander,
and the older specifications. SD 2.0 SDHC requires 512 byte sectors now, but
the older standard is still used for 2GB cards.

Most USB card readers seem to translate the native sector size to 512 byte
sectors internally, and we've seen that the linux SCSI disk driver together
with the USB mass storage driver doesn't cope well with the device
Alexia is using.

	Arnd <><
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