Mounting a SD card as RW still give RO filesystem

[david-8uUts6sDVDvs2Lz0fTdYFQ at public.gmane.org (David Kramer)]

I'm trying to copy files from my laptop onto the MicroSD card for my
cellphone using a card reader.  This has worked before, but now no
matter what I do, it says it's a read only filesystem.

david at lexa:~$ l /mnt/tmp
total 8
drwxrwxrwx 2 root root 4096 2009-09-27 01:42 .
drwxr-xr-x 3 root root 4096 2009-09-27 01:42 ..

david at lexa:~$ sudo mount /dev/sdd1 /mnt/tmp/ -o 'rw,user'

david at lexa:~$ l /mnt/tmp
ls: cannot access /mnt/tmp/Video: Input/output error
total 1220
drwxr-xr-x 21 root root  32768 1969-12-31 19:00 .
drwxr-xr-x  3 root root   4096 2009-09-27 01:42 ..
-rwxr-xr-x  1 root root  16228 2009-01-19 11:09 0901_arisia.docx
drwxr-xr-x  4 root root  32768 2009-07-15 23:43 Application Data
drwxr-xr-x  3 root root  32768 2008-02-16 08:13 Backups
...
drwxr-xr-x  2 root root  32768 2007-08-02 01:03 testdir
drwxr-xr-x  4 root root  32768 2009-08-24 02:09 .Trash-1000
d?????????  ? ?    ?         ?                ? Video
drwxr-xr-x  2 root root  32768 2009-01-19 23:07 Windows
drwxr-xr-x  2 root root  32768 2007-07-23 11:07 wmdrm
-rwxr-xr-x  1 root root    296 2009-01-20 01:04 WMPInfo.xml

david at lexa:~$ touch /mnt/tmp/me
touch: cannot touch `/mnt/tmp/me': Read-only file system

david at lexa:~$ sudo touch /mnt/tmp/me
touch: cannot touch `/mnt/tmp/me': Read-only file system

david at lexa:~$ mount | grep /mnt/tmp
/dev/sdd1 on /mnt/tmp type vfat (rw,noexec,nosuid,nodev)


So it's mounted rw, and I can't even write to it as root.

Any clues?  Thanks.