Mounting usb pendrive

[Isidoro Reyes de Zuloaga]

Hi folks,
I'm trying to mount my usb pendrive device and i'm getty a strange error 
message. I compiled my kernel with the scsi modules and all the stuff, and i 
can mount it on my x86, but in the powerbook i can't.
this is the /var/log/messages:

Nov 30 12:01:18 yoda kernel: usb 2-1.1: new full speed USB device using 
address 11
Nov 30 12:01:18 yoda kernel: usb 2-1.1: new full speed USB device using 
address 12
Nov 30 12:02:04 yoda kernel: ohci_hcd 0001:10:1b.1: wakeup
Nov 30 12:02:04 yoda kernel: usb 3-1: new full speed USB device using address 
5
Nov 30 12:02:05 yoda kernel: uba: device 5 capacity nsec 50 bsize 512
Nov 30 12:02:05 yoda kernel: uba: made changed
Nov 30 12:02:05 yoda kernel: uba: device 5 capacity nsec 50 bsize 512
Nov 30 12:02:05 yoda kernel: uba: device 5 capacity nsec 50 bsize 512
Nov 30 12:02:05 yoda kernel:  /dev/ub/a:end_request: I/O error, dev uba, 
sector 0
Nov 30 12:02:05 yoda kernel: end_request: I/O error, dev uba, sector 2
Nov 30 12:02:05 yoda kernel: end_request: I/O error, dev uba, sector 4
Nov 30 12:02:05 yoda kernel: end_request: I/O error, dev uba, sector 6
Nov 30 12:02:05 yoda kernel: end_request: I/O error, dev uba, sector 6
Nov 30 12:02:05 yoda kernel: end_request: I/O error, dev uba, sector 4
Nov 30 12:02:05 yoda kernel: end_request: I/O error, dev uba, sector 2
Nov 30 12:02:05 yoda kernel: end_request: I/O error, dev uba, sector 0
Nov 30 12:02:05 yoda kernel:  unable to read partition table
Nov 30 12:02:05 yoda kernel:  /dev/ub/a:end_request: I/O error, dev uba, 
sector 2
Nov 30 12:02:05 yoda kernel: end_request: I/O error, dev uba, sector 4
Nov 30 12:02:05 yoda kernel: end_request: I/O error, dev uba, sector 6
Nov 30 12:02:05 yoda kernel: end_request: I/O error, dev uba, sector 0
Nov 30 12:02:05 yoda kernel:  unable to read partition table
Nov 30 12:02:05 yoda usb.agent[4698]:      ub: already loaded

I don't know what's happening, it's the same when i try to mount the ipod. my 
modules are: 
usb_storage           107772  0
scsi_mod               69856  3 sd_mod,sg,usb_storage
usbhid                 46592  0
hci_usb                11104  2
bluetooth              44100  7 rfcomm,l2cap,hci_usb
usbcore               105204  9 
ehci_hcd,ub,ohci_hcd,usb_storage,uhci_hcd,usbhid,hci_usb


Everything seems to be right, uh??
Thanks for your help. 
isidoro