On Friday 21 May 2010, Yann Droneaud wrote: > Le jeudi 20 mai 2010 à 21:06 -0400, Vencabot Teppoo a écrit : > > Hello, community! This is my first time joining a mailing list, so > > excuse me if my netiquette leaves anything to be desired, and let me > > know. > > Hi, > > I have a Kingston SDC4/4GB-2ADP : 4GB SHDC which shows write errors when > access are not aligned on a boundary. I've first suspect a problem with > the Freerunner has the problem only arise when booting from this SD > card. > But I've tested it latter with a USB card reader (Transcend M5) and > found problems when random reading/writing on a partition. > I've retried with 1MB aligned partitions and found that everything was > going well. > > So aligning partition is not only a matter of performance, for some card > it's also a requirement. > > To align partition with fdisk from util-linux use the following options: > > c - toggle msdos compatibility flag > u - set unit to sectors instead of cylinder > > See for example: > http://old.nabble.com/-ANNOUNCE--util-linux-ng-v2.17.1-td27685302.html
Very interesting. I've not seen that mentioned for SD cards before. I have one of those that's resisted all other attempts to get it working reliably in a Freerunner, but the same partition table is fine when the card is in a usb card reader, or the SD slot on my netbook. I'll have to give this a try. _______________________________________________ Openmoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
