Storage Device Manager can't see mounted partitions

[Young]

Do anyone know why Storage Device Manager can't see mounted partitions?

System > Administration > Storage Device Manager
shows sda1 which is ext3
but not sda3 or sda4 which are NTFS
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fdisk shows all of the partitions.

Disk /dev/sda: 203.9 GB, 203928109056 bytes
255 heads, 63 sectors/track, 24792 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x73d073d0

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        1305    10482381   83  Linux
/dev/sda2            1306        1566     2096482+  82  Linux swap / Solaris
/dev/sda3            1567        2219     5245222+   7  HPFS/NTFS
/dev/sda4            2220       24792   181317622+   7  HPFS/NTFS

Disk /dev/sdb: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00940094

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1       19457   156288321    7  HPFS/NTFS
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Nautilus and Places show them just fine, but until they're mounted
by some user action, they aren't available to a program like Thunderbird
or even for the desktop background.

This is a new Ubuntu 8.04 install, completely updated.