From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnd Bergmann Subject: Re: why would an SD card, after 12 hours, start to fail recording video? Date: Thu, 26 May 2011 08:01:22 +0200 Message-ID: <201105260801.22805.arnd@arndb.de> References: <201105242124.13856.arnd@arndb.de> <6AAC4214B9104E409FF4885ACB62A96101A78AD977@SHEXMB-01.global.atheros.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from moutng.kundenserver.de ([212.227.17.8]:50151 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755011Ab1EZGBZ (ORCPT ); Thu, 26 May 2011 02:01:25 -0400 In-Reply-To: <6AAC4214B9104E409FF4885ACB62A96101A78AD977@SHEXMB-01.global.atheros.com> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Patrick Fu Cc: "Robert P. J. Day" , "linux-mmc@vger.kernel.org" On Thursday 26 May 2011, Patrick Fu wrote: > > There are many reasons why this could happen: > > > > * You used a Kingston (or other cheap) SD card with a file system other > > than FAT32 > > > > I'm just curious. How could this thing (file system type) affect read/write operations? > Could you explain it a little? > See my article at https://lwn.net/Articles/428584/ and the survey at https://wiki.linaro.org/WorkingGroups/Kernel/Projects/FlashCardSurvey. Many cheap cards are designed for a very specific file system layout. If you do something else, you can have orders of magnitude higher write amplification. Arnd