cannot mount IDE Zip

[Rachmat Hidajat]

Hi there,
Recently I installed 5.2-RELEASE on a Dell Optiplex GX1 (BIOS A10) with 
internal IDE Zip drive, but seems the drive is not recognized properly:

# dmesg |grep ad
ad0: 4110MB <QUANTUM FIREBALL SE4.3A> [14848/9/63] at ata0-master UDMA33
ad1: 9729MB <QUANTUM FIREBALLP LM10.2> [19767/16/63] at ata0-slave 
UDMA33
ad3: FAILURE - SETFEATURES ENABLE RCACHE status=51<READY,DSC,ERROR> 
error=4<ABORTED>
ad3: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> 
error=4<ABORTED>
ad3: 96MB <IOMEGA ZIP 100> [512/12/32] at ata1-slave BIOSPIO
-----------------------------
# fdisk ad3
******* Working on device /dev/ad3 *******
parameters extracted from in-core disklabel are:
cylinders=512 heads=12 sectors/track=32 (384 blks/cyl)

parameters to be used for BIOS calculations are:
cylinders=512 heads=12 sectors/track=32 (384 blks/cyl)

Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 6 (0x06),(Primary 'big' DOS (>= 32MB))
     start 32, size 196192 (95 Meg), flag 80 (active)
         beg: cyl 0/ head 1/ sector 1;
         end: cyl 510/ head 11/ sector 32
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>
------------------------------
# mount /dev/ad3s1 /mnt
mount: /dev/ad3s1 on /mnt: incorrect super block
------------------------------
# mount /dev/ad3s4 /mnt
mount: /dev/ad3s4: No such file or directory
------------------------------
Even pushing the button won't eject the disk.
Is there some incompatibily between BIOS and FreeBSD, since the drive 
works very well in Windows environment?

Rachmat Hidajat