I've just got a new external microSDHC, deleted its vfat partition, created another one, formated it as ext3 and placed the card in the N900.

* File manager says the "card is corrupted".

* "sfdisk -l" shows a warning:
"Warning: The partition table looks like it was
made for C/H/S=*/255/63 (instead of 486192/4/16)"

Now some questions:

1) Is there anything that must be done on the N900 to get the external MMC working with ext3?

2) Did GParted on the desktop mess up the disk? Under debian the MMC is fine.

3) Is there a recommendation for a POSIX file system for the external microSD? I've used ext3 because I thought that because the eMMC was already formated as ext3 it would avoid any further problems.

The card isn't defective. The auto mount scripts are the defective ones. :-(

If you mount the card manually, in terminal, it works:

mount -t ext3 -o noatime,nodiratime /dev/mmcblk1p1 /media/mmc1


I don't know why, but the developers made the scripts in such way to avoid auto mounting non FAT file systems. But I've found another thread which explains how to prepare automount by changing two of the scripts.

http://talk.maemo.org/showthread.php?t=42045