I have problem with mounting USB PenDrive under 2.6.3 kernel.
Drive is recognized succesfully and is connected to /dev/sda1.
The log after drive plug-in looks:

usb 2-2.1: new full speed USB device using address 8
Initializing USB Mass Storage driver...
scsi3 : SCSI emulation for USB Mass Storage devices
Vendor: Model: USB BAR Rev: 1.89
Type: Direct-Access ANSI SCSI revision: 02
SCSI device sda: 255744 512-byte hdwr sectors (131 MB)
sda: assuming Write Enabled
sda: assuming drive cache: write through
/dev/scsi/host3/bus0/target0/lun0: p1
Attached scsi removable disk sda at scsi3, channel 0, id 0, lun 0
Attached scsi generic sg0 at scsi3, channel 0, id 0, lun 0, type 0
WARNING: USB Mass Storage data integrity not assured
USB Mass Storage device found at 8
drivers/usb/core/usb.c: registered new driver usb-storage
USB Mass Storage support registered.

Everything works fine with ext2 or ext3 filesystem created on this storage. There are no problems with mounting. But, when I format drive with fat32 filesystem, there is an error after mounting:
mount: /dev/sda1: can't read superblock
I use command: mount /dev/sda1 /mnt/removable -t vfat

I think that the problem is with kernel version 2.6. I was trying connect this PenDrive with kernel 2.4, and everything was beautiful.

Regards,
jarro

I have tried with kernel version 2.6.7, and there was working !!! Maybe in this version all problems with usb storage (posted on this forum) are solved. You should try.