fun with SD cards

[Owen Williams]

On Wed, 2006-12-06 at 07:48 -1000, Mitch Bradley wrote:
> The mount time for a 4G JFFS2 volume will be pretty long.  Another 
> problem is that you will use up a lot of kernel memory for JFFS2 
> internal data structures with a volume that size, assuming that you put 
> a lot of data on it.  We have pushed JFFS2 well past its design center 
> with the 512 MiB FLASH.  It was really designed for FLASH sizes in the 
> 32-64 MiB range.

interesting.

> 
> I will probably get piled-on for saying this, but in my experience, 
> plain FAT filesystems work well for removable media.  FAT was originally 
> designed for removable media (floppy disks), which is not the case for 
> ext2.  I routinely use a couple of USB keys to transfer stuff between my 
> host system and OLPC boards.  The ext2/3 has needed to be reformatted 
> several times, whereas the FAT one is still using the factory format.

In this case the SD card will be pure data storage for mp3s and various
bits of file backup, so FAT might be the way to go.