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: Tue, 24 May 2011 21:24:13 +0200 Message-ID: <201105242124.13856.arnd@arndb.de> References: Mime-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from moutng.kundenserver.de ([212.227.17.10]:55406 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753832Ab1EXTYT (ORCPT ); Tue, 24 May 2011 15:24:19 -0400 In-Reply-To: Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: "Robert P. J. Day" Cc: linux-mmc@vger.kernel.org On Tuesday 24 May 2011 19:11:48 Robert P. J. Day wrote: > a maddeningly vague question -- i'm currently after more information > -- but i've been told about an issue where someone is recording video > to an SD card and, after 12 hours, the units begin to "fail." that's > all the info i have at the moment, i hope to get more so i don't even > know what the definition of "fail" is here, or the brands or models or > vendors involved, only what you read above. > > has anyone run across something like this before? again, i realize > this is annoyingly vague but if i had a hint as to what might be > going on, i might be able to offer some advice. what could possibly > cause properly recording SD cards to start misbehaving after several > hours? thanks for any wildly speculative guesses. There are many reasons why this could happen: * You used a Kingston (or other cheap) SD card with a file system other than FAT32 * The partition is not aligned to 4 MB * The cluster size is less than 16 KB * You have multiple partitions on the card If any of these are true, you have destroyed the card by writing a lot of data to it. Arnd