USB stick no longer automounting at boot

I have today set up a new installation of Linux Mint and it is
exhibiting the same symptoms as my installation of Squeeze as follows
- I have a USB stick permanently plugged in (for backup purposes) and
when the system boots the stick is not mounted. When I first installed
it mounted ok and I could see it on the desktop, but now I have to
physically unplug and replug the stick to get the system to mount it.
I think this behaviour may have occurred after I installed a trial
version of NOD32 antivirus for Linux (on both systems), but I'm not
certain. I stopped NOD32 from starting at boot but this doesn't make
any difference, so I don't know if that is the cause or maybe some
other software update. Any ideas would be welcome.

My knowledge is pretty elementary at this level but I have run the
following 2 commands to check that the device is recognised:

fdisk -l reveals:

Disk /dev/sdb: 4076 MB, 4076863488 bytes
166 heads, 54 sectors/track, 888 cylinders
Units = cylinders of 8964 * 512 = 4589568 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xc3072e18

Device Boot Start End Blocks Id System
/dev/sdb1 1 889 3981288 c W95 FAT32 (LBA)
Partition 1 has different physical/logical endings:
phys=(495, 165, 54) logical=(888, 47, 54)

also blkid gives:

/dev/sdb1: LABEL="ISISBACK" UUID="D743-AC68" TYPE="vfat"


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