Mint 8 doesnt automount usb drive

[Petoooo]

Hello, 2 days ago, it stopped to automount my usb drive(s). However, I can mount it through terminal. I dont know where is the problem, but i think linux sees usb drive. Here is lsusb (when usb drive plugged)
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 002: ID 0458:0072 KYE Systems Corp. (Mouse Systems)
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 125f:b01a A-DATA Technology Co., Ltd.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 04f2:b083 Chicony Electronics Co., Ltd
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
u see, my usb drive is a-data ...but it doesnt automount. I added this line to fstab: /dev/sdb1 /media/usbdrive vfat defaults,noauto,owner,rw,uid=peto,gid=peto 0 , after this i can mount it through sudo mount /media/usbdrive and unmount with sudo umount /media/usbdrive . But this is pretty slow . Its interesting that usb mouse is detected clearly.. Can u tell me where is the problem? And how can I fix it? (btw I have 4 usb slots, 1 is occupied by mouse)
Ps: usb is recognized in my sisters pc (windows xp). Help, please!

[Petoooo]

ADD:
if i run gparted, it sees usb disk, but it says its not mounted.

[Petoooo]

these are new messages in tail -f /var/log/messages when is unplug and plug usb flash disk:
Jan 3 12:29:09 peto-laptop kernel: [ 9828.406201] usb 1-5: USB disconnect, address 5
Jan 3 12:29:15 peto-laptop kernel: [ 9834.364539] usb 1-5: new high speed USB device using ehci_hcd and address 6
Jan 3 12:29:15 peto-laptop kernel: [ 9834.499716] usb 1-5: configuration #1 chosen from 1 choice
Jan 3 12:29:15 peto-laptop kernel: [ 9834.501380] scsi7 : SCSI emulation for USB Mass Storage devices
Jan 3 12:29:20 peto-laptop kernel: [ 9839.508111] scsi 7:0:0:0: Direct-Access A-DATA USB Flash Drive 0.00 PQ: 0 ANSI: 2
Jan 3 12:29:20 peto-laptop kernel: [ 9839.508556] sd 7:0:0:0: Attached scsi generic sg2 type 0
Jan 3 12:29:20 peto-laptop kernel: [ 9839.516286] sd 7:0:0:0: [sdb] 3948544 512-byte logical blocks: (2.02 GB/1.88 GiB)
Jan 3 12:29:20 peto-laptop kernel: [ 9839.519146] sd 7:0:0:0: [sdb] Write Protect is off
Jan 3 12:29:20 peto-laptop kernel: [ 9839.528317] sdb: sdb1
Jan 3 12:29:20 peto-laptop kernel: [ 9839.753883] sd 7:0:0:0: [sdb] Attached SCSI removable disk
But simply, i cant find it. It looks liek its not mounted ..