USB HD w/2 partition will mount, but not at boot

[robrosenthal1]

Greetings all!

Everything I've seen on this problem has to do with pen drives and the 
like, but my problem is with my external USB hard drive.  I'm running 
FC2 on an HP zt1175 laptop.  The USB drive has two vfat partitions 
detected as sda1 and sda2.  I added the following entries into my 
/etc/fstab file:

/dev/sda1        /mnt/fat1        vfat    auto,users,umask=0    0 0
/dev/sda2        /mnt/fat2        vfat    auto,users,umask=0    0 0

When my system boots, I get an error message for each partition stating 
that it "is not a vaild block device."  However, I can mount them both 
by entering the shell and doing the following:

sudo mount -a

I have also tried the following lines in fstab, but this gave me the 
same exact results:

/dev/sda1 /mnt/fat1 auto 
auto,rw,uid=0,gid=501,showexec,quiet,fmask=117,dmask=007 0 0
/dev/sda2 /mnt/fat2 auto 
auto,rw,uid=0,gid=501,showexec,quiet,fmask=117,dmask=007 0 0

Does anyone have any suggestions?  Any help would be greatly appreciated!

Rob
Registered Linux User #379760