Hi,

just for future reference (as gotten from the article on mycomputingart, tx Char) because I received and *fixed* the same error with those instructions:

When your N900 doesn't mount the vfat partition on mmcblk0p1 anymore and you get 'bad superblock' or "logical sector size is zero", try this:
0. (make a backup of /dev/mmcblk0p1 first if possible!, verify you have the correct "mmcblk0p1" partition *before* pressing enter !)
1. start a terminal on the N900, give these commands:
> sudo gainroot
> dd if=/dev/mmcblk0p1 of=/home/user/sector6.bin bs=512 skip=6 count=1
> dd if=/home/user/sector6.bin of=/dev/mmcblk0p1 bs=512 count=1
(wait a few seconds)

3.Now try one of these:
> mount /dev/mmcblk0p1 /home/user/MyDocs
OR
> reboot
(or simply switch off and switch back on)

Sander