USB Drive with FAT32 on Blade 2000 with Solaris 9

I attached a Western Digital USB Drive to the USB-Post of my Sun Blade 2000 running Solaris 9. It is detected immediately:
iostat -En< ... snip SCSI & DVD drives ... >
c3t0d0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: WDC Product: WD2500JB0104153 Revision: Serial No: Size: 250.06GB <250059350016 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 0 Predictive Failure Analysis: 0
The drive can be formatted (takes ages) and UFS set up and it runs fine with that. But the goal is to have it running with FAT32 for data exchange with other systems. If it is formated FAT32 with Windows it cannot be mounted using for example
mount -F pcfs dev/dsk/c3t0d0s2 /mnt
mount -F pcfs dev/dsk/c3t0d0s2:1 /mnt
mount -F pcfs dev/dsk/c3t0d0sX:Y /mntetc. with variing numbers for X and Y!
The error message always is equivalent to (I can't recall the exact words): no valid DOS-filesystem found.
Invoking "format" and selecting the disk then asks if the disk should be labeled. If answered with yes all the disk is in one partition. Labelling the disk seems to kill all partitions as reattaching the disk to a Windows computer has the result that the disk has to be initialized and new partitions created. All data is hence lost.
I also tried creating a FAT32 filesystem from Solaris (which would be nice actually, as Windows isn't able to format 250Gig with FAT32 in one chunk) after creating a new partition using:
mkfs -F pcfs dev/dsk/c3t0d0s7Trying to mount this slice then yields:
mount -F pcfs dev/dsk/c3t0d0s7 /mntI/O error
Now I'm out of ideas! Do I have to "activate" FAT32 support specially? It all seemed so easy reading the "Managing USB Devices" in the Solaris 9 Documentation.
Thanks for any help in advance!

Did you try
mount -F pcfs /dev/dsk/c3t0d0s2:c /mnt
What's the contents of the fdisk partition table on Solaris, after you've prepared the USB HDD on windows?
The command "fdisk -W - /dev/dsk/c3t0d0s2" prints the raw fdisk partition infomation.
You can also try to create the pcfs filesystem on Solaris, using something like this:
fdisk /dev/rdsk/c3t0d0s2 (create a 100% FAT32LBA partition, activate it and write back the fdisk label)
mkfs -F pcfs -o fat=32 /dev/rdsk/c3t0d0s2:c

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