[Bug 589369] Re: No automount for 8GB SDHC card: "FAT: Invalid FSINFO signature: 0x41645252, 0x61417272 (sector = 1)"

[Idefix]

The problem is that your Marantz audio recorder is writing an incorrect
value to the FSINFO signature of the FAT filesystem (the vfat driver
also tells you that: "Invalid FSINFO signature: 0x41645252, 0x61417272
(sector = 1)".)

The correct FSINFO signature should be: 0x41615252, 0x61417272

I suspect that smaller cards work because they are formatted as FAT
(which doesn't have a FSINFO signature), while SDHC cards are formatted
as FAT32.

So the best fix would be for Marantz to update their firmware to write
the correct FSINFO signature. But if the card does automount in Windows
as you said, I doubt they would have any motivation to do that. Could
you test if the SDHC card (formatted in the audio recorder) is correctly
recognised by a recent Windows version (XP+) when using a standard card
reader (not the Marantz) and the standard Windows USB drivers?

The next best fix would therefore be to add a check for this incorrect
FSINFO signature to the vfat superblock module of the libblkid library.
But I'm not sure if the util-linux-ng maintainers will accept this
'hack'.

-- 
No automount for 8GB SDHC card: "FAT: Invalid FSINFO signature: 0x41645252, 0x61417272 (sector = 1)"
https://bugs.launchpad.net/bugs/589369
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